https://grapheneos.org/features#other-features
Call recording functionality within the Dialer app using modern Android storage with recordings stored in Recordings/Call Recordings and no restrictions based on region or special cases like playing a recording tone (users are still responsible for complying with their local laws).
Says there's no region block, so not sure why it wouldn't be there for you.
Edit: the button only shows up when a call connects & it's on the bottom right.
Fair enough if those are deal breakers for anyone; just letting people know. Automatic would be nice, but couldn't care less about banking apps personally.