This web part makes a modern SharePoint page into a Teams tab configuration page for use in a Teams application. This allows low-code developers to create Teams applications containing configurable tabs without the need to code a custom configuration page. Using this tool, along with Microsoft Teams App Studio, low-code developers can build Teams applications entirely from modern SharePoint pages.
Open this sample in the gallery (popup panel): Open in gallery
Source: https://github.com/pnp/sp-dev-fx-webparts/tree/main/samples/react-teams-configure-tab