CI4: How to run modules in views?

Whatever you call in the cell can generate the HTML. Use a view partial for whatever you want to display and generate that within the modules method, then return the generated HTML to cell.

That's the only variant we have, but that should work, right?

Yes this variant with view_cell good work for me too. Maybe I'm just used to CI3+HMVC and think by the standards of this version. Thanks a lot for clarification about this functional. P.S. I'm waiting for your book https://leanpub.com/codeigniter4foundations. I hope is coming soon)