LUKS with btrfs?

[Framsfex]

I tried to install Mint with LUKS and btrfs for /, but I failed.
With the Mint Installer I can only install LUKS together with ext4, there is no option for btrfs.
For several reasons I need btrfs for the / filesystem AND full encryption (LUKS).
I was using linuxmint-21.2-xfce-64bit.iso

[eco-star]

I would appreciate btrfs in the installer aswell. Now that timeshift is part of the mint-apps, it would make sense to add the possibility directly to the installer.