When using PowerApps with Flows, It would be nice to be able to use other Content-Types when performing REST API calls. application/vnd.api+json. doesn't appear to be support with the current HTTP tool.
Connections to a SharePoint list should provide the Content Type field as well as determine if a list field is applicable to the item based on the content type. The View form should automatically hide fields that dont apply to the item based on the content type OR swich logic to load a specific screen based on the content type of the selected item.