64bit ARM docker container

I have a raspberry pi 4 (4GB) running OSMC. I installed docker time ago and it works great.
The problem is my sonarr docker container has been deprecated for 32-bit versions.

I know system is 64-bit and userland is 32-bit for rpi4.
Can I use an arm64 container? Or install a 64-bit version of docker?

Yes, a 64-bit container should work fine.