Could you please provide the screenshots of what summary key creates exactly?

Here are two entries before from before this PR.

and here are the same entries after adding the summary.

Thank you, guys.
This is exactly the kind of functionality I was hoping for, as long as it also works in the Publication section

Thank you for the pull request!

I think it would be the best to not merge this.

We are planning to transition to Typst soon, and each design update like this increases the complexity of maintenance. We need to ensure that design (LaTeX templates) works as expected with various combinations of design settings, which requires extensive manual testing. Currently, RenderCV runs robustly with its LaTeX templates, and we wouldn't want to break it right before we switch to Typst. Typst will require a lot of work. We can implement these in Typst.

For those interested in using these keys in RenderCV:

It is already quite simple to do so. That's why we allow users to use arbitrary keys in their YAML files and override the default LaTeX templates. Check out the links for details.