you want to follow these issues, it’s a popular request to do this on-device
- https://gitlab.com/fdroid/fdroidclient/-/issues/1484
- https://gitlab.e.foundation/e/backlog/-/issues/5210 (this is just for listing apps - for export/import I couldn’t find an issue)
off-device with adb attached, you could script install-from-a-list with fdroidcl and gplaydl for the play store:
the pm command can appids with install origin - List of installed apps from within the Apps app? - #2 by tcecyk