I had to migrate from Authy because it doesn't work on Graphene OS. Migrated to Ente Auth and couldn't be happier.
Google Authenticator has an export-as-QR-code function that several other authenticator apps can parse. Is it the best/most convenient implementation? Obviously not, but you can absolutely export the codes.
Notably not password managers.
Comment you're replying to should've specified afterwards. Feature that were never there is very different than pay walling a such essential feature.