bocekm You might want to look at @Volen's response.
Also, keep in mind that GrapheneOS can also allow you to use Play Store while keeping it sandboxed like other apps, which you may need if you want paid apps, or need apps that use Play Asset Delivery etc.
You can read more about it here:
https://grapheneos.org/features#sandboxed-google-play
Of course, that's completely opt-in, so you can pick and choose whatever you want.