Please help with the container mounting command on RouterOS 7.21.3

Hello. I'm having trouble mounting the config file in the image due to the switch to mount lists in RouterOS 7.21.3.

/container/set mounts=config.json numbers=0 returns an error on the = sign in mounts=config.json, and the command /container/set mountlists=config.json numbers=0 returns the error "failure: cannot change root-dir"

I couldn't find any solutions online.

Thanks in advance