Script allow copy column format in SharePoint and apply to different column.

#site collection url
$url = "https://<tenant>.sharepoint.com"

#list to be exported  
$listName = "ListTitle"

## Connect to SharePoint Online site  
Connect-PnPOnline -Url $Url -Interactive

#----method 1 Apply formatting from existing column sample in sharepoint-------#
# field title with existing format - ChoiceFld
$field = Get-PnPField -Identity "ChoiceFld" -List $listName

#copy field format
$fieldFormat = $field.CustomFormatter

#apply field format to other column
# field title with no format - ChoiceFldFormattedViaPowershell
Set-PnPField -List $listName -Identity "ChoiceFldFormattedViaPowershell" -Values @{CustomFormatter=$fieldFormat}

#---method 2 Apply formatting directly from script
Set-PnPField -List $listName -Identity "ChoiceFldFormattedViaPowershell" -Values @{CustomFormatter=@'
{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",
  "elmType": "div",
  "style": {
    "position": "relative"
  },
  "children": [
    {
      "elmType": "div",
      "attributes": {
        "class": "=if([$DueDate] <= @now, 'sp-field-severity--severeWarning', if(1 - Number([$DueDate] - @now) / Number([$DueDate] - [$StartDate]) >= 0.7, 'sp-field-severity--war
ning', 'sp-field-severity--good'))"
      },
      "style": {
        "min-height": "inherit",
        "width": "=if([$DueDate] <= @now, '100%', (1 - Number([$DueDate] - @now) / Number([$DueDate] - [$StartDate])) * 100 + '%')"
      }
    },
    {
      "elmType": "span",
      "txtContent": "@currentField",
      "style": {
        "position": "absolute",
        "left": "8px"
      },
      "attributes": {
        "class": "ms-fontColor-neutralSecondary"
      }
    }
  ]
}
'@
}

#----method 3 Apply formatting using sample from github-------#
$webContent = Invoke-WebRequest -Uri 'https://raw.githubusercontent.com/pnp/List-Formatting/master/column-samples/date-range-rag/date-range-rag.json' 
$fieldFormatFromGit = $webContent.Content 

$fieldToFormat = Get-PnPField -Identity "GitHubFormatted" -List $listName
$fieldToFormat.CustomFormatter = $fieldFormatFromGit
$fieldToFormat.UpdateAndPushChanges($true)

#site collection url
$url = "https://<tenant>.sharepoint.com"

#list to be exported  
$listName = "ListTitle"

## Connect to SharePoint Online 
$m365Status = m365 status
if ($m365Status -match "Logged Out") {
  m365 login
}

#----method 1 Apply formatting from existing column sample in sharepoint-------#
# field title with existing format - ChoiceFld
$field = m365 spo field get --webUrl $url --listTitle $listName --fieldTitle "ChoiceFld" | ConvertFrom-Json

#copy field format
$fieldFormat = $field.CustomFormatter.Replace('"', '""')

#apply field format to other column
# field title with no format - ChoiceFldFormattedViaPowershell
m365 spo field set --webUrl $url --listTitle $listName --name "ChoiceFldFormattedViaPowershell" --CustomFormatter $fieldFormat

#---method 2 Apply formatting directly from script

$fieldFormat = @'
{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",
  "elmType": "div",
  "style": {
    "position": "relative"
  },
  "children": [
    {
      "elmType": "div",
      "attributes": {
        "class": "=if([$DueDate] <= @now, 'sp-field-severity--severeWarning', if(1 - Number([$DueDate] - @now) / Number([$DueDate] - [$StartDate]) >= 0.7, 'sp-field-severity--warning', 'sp-field-severity--good'))"
      },
      "style": {
        "min-height": "inherit",
        "width": "=if([$DueDate] <= @now, '100%', (1 - Number([$DueDate] - @now) / Number([$DueDate] - [$StartDate])) * 100 + '%')"
      }
    },
    {
      "elmType": "span",
      "txtContent": "@currentField",
      "style": {
        "position": "absolute",
        "left": "8px"
      },
      "attributes": {
        "class": "ms-fontColor-neutralSecondary"
      }
    }
  ]
}
'@

m365 spo field set --webUrl $url --listTitle $listName --name "ChoiceFldFormattedViaPowershell" --CustomFormatter $fieldFormat.Replace('"', '""')

#----method 3 Apply formatting using sample from github-------#
$webContent = Invoke-WebRequest -Uri 'https://raw.githubusercontent.com/pnp/List-Formatting/master/column-samples/date-range-rag/date-range-rag.json' 
$fieldFormatFromGit = $webContent.Content 

m365 spo field set --webUrl $url --listTitle $listName --name "GitHubFormatted" --CustomFormatter $fieldFormatFromGit.Replace('"', '""')

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",
  "elmType": "div",
  "style": {
    "position": "relative"
  },
  "children": [
    {
      "elmType": "div",
      "attributes": {
        "class": "=if([$DueDate] <= @now, 'sp-field-severity--severeWarning', if(1 - Number([$DueDate] - @now) / Number([$DueDate] - [$StartDate]) >= 0.7, 'sp-field-severity--warning', 'sp-field-severity--good'))"
      },
      "style": {
        "min-height": "inherit",
        "width": "=if([$DueDate] <= @now, '100%', (1 - Number([$DueDate] - @now) / Number([$DueDate] - [$StartDate])) * 100 + '%')"
      }
    },
    {
      "elmType": "span",
      "txtContent": "@currentField",
      "style": {
        "position": "absolute",
        "left": "8px"
      },
      "attributes": {
        "class": "ms-fontColor-neutralSecondary"
      }
    }
  ]
}