Is your feature request related to a problem? Please describe.
For now all docker data are stored into %USERPROFILE%\AppData\Local\Docker\wsl\data\ext4.vhdx. File ext4.vhdx can become very large due too many images or too many container runs. The last one is very important during development when I need to build a new container every time.
From other side (and as I understand) images/layers are very infrequent data and are stored in gz archives. So they can be stored in HDD - here we save space and lifetime for SSD.
Describe the solution you'd like
Add the ability to separate docker images and docker container stores. I can store large image data on HDD and use SSD for containers (or event mount RAM for them)