@neel Thanks for your answer
I decided to go with Ubigi based on many recommendations, but now I have the following issue:
First, I installed the app in the second profile and purchased it there. However, I couldn't activate the eSIM there because grapheneos doesn't support it in the second profile. Now I've uninstalled the app in the second profile and wanted to reinstall it in the owner profile. I received an error message in the Aurora Store, so I temporarily installed Google Play services. Unfortunately, I still can't install the Ubigi app, but I can still install it in the second profile.
The error message:
com.aurora.store.data.work.DownloadWorker...
com.aurora.store.data.work.DownloadWorker...
com.aurora.store.data.work.DownloadWorker...
How can I install the app in the owner profile so that I can start using the ubigi eSIM in some days?