Mount additional vhxd-Files (next to ext4.vhdx) to single instance on startup

[Cyber1000]

I know you can mount an additional partition to wsl with the wsl --mount command, but it's not dedicated to a single instance and it needs to be done on every reboot.

My aproach is different:

• Having mulitple vhxds in C:\Users{username}\AppData\Local\Packages{instance}\LocalState next to ext4.vhdx you could have more than one disk within your instance. Of course ext4.vhdx would be the main disk, but I would move fast growing files (caches, docker-images, ...) to another disk and bind-mount them or link them back to somewhere on root-partition.
• My problem everysome months is, that my ext4.vhdx-s are taking all my disk space and I need to shrink the vhdx with some tool. Would be nice to keep system-partition ext4.vhdx out of this (wouldn't grow that much, since I don't install a lot of new things) and only shrink my caches-partition from time to time. Though compressing always worked so far, it's a point where things could go wrong (needing a backup if done right)