Is it possible to add a sub command to dnf5 like was on dnf4?

Project Discussion
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1

like sudo dnf hellothat prints > hello there . I have tried many ways following the examples on https://dnf5.readthedocs.io/ but cant get any of it to work.

2

I see in the docs discussion of plugins and saw this section Tutorial: Writing Plugins — dnf5 documentation
Also discussion of actions.

3

You can also check the code of existing plugins. dnf5/dnf5-plugins at main · rpm-software-management/dnf5 · GitHub