For those that are looking to install GrapheneOS and want to ensure that their banking apps work as intended, here is a curated list with app compability status per country.
Each entry also lists required settings, profile and whether they need access to Google Play services, among other details.
Update on 2024-12-23: The following site is a great resource as well, it provides details on MFA support for various services grouped by country (not only banking): https://2fa.directory/
Thank you @jagged_circle@feddit.nl for the suggestion!
Thank you! Updated the post with a link to this resource.