It's "supported" but only via accesing the Authenticator's files (or by havitng root access) which in my celphone is not possible (OnePlus Nord).
Weirdly enough, Aegis does not support bulk importing keys from a QR code, which is how you can migrate from one Authenticator instance to another (e.g. to a new phone).
And I am too lazy to go over each key, reset it and load it up again in Aegis.
Hooefully they'll add this feature at some point in the future.