TrueCharts is not an option as they dropped all scale support
I would advise you to:
Temporarily install jailmaker and spin up docker, that will solve most of your problems… this is a temp fix to keep in place until November… Use Stux Video on how to do it
The permanent solution is TrueNas Scale Elecric Eel which just entered RC1 and has k3 removed and NATIVE DOCKER installed
then here you do a simple migration
or if this is not a production situation you could install the RC candidate of EE and you have native docker just please dont do this if this is a production environment…
thanks to Stux for these he helped allot