Can we please get an option for setting temporary groups to users upon joining from the config file?

Example of what it could look like:

default-assignments:
  my-defaults-rule:
    if:
      has-true: <group.default>
    take:
      - group.default
    give:
      - group.member 24d12h6m
    set-primary-group: member

The default assignment got removed in the upcoming V5 update (#1537).
However, will this update include a separate system for default groups on join that may or may not support what you're suggesting.