Extending fields - documentation

Hi everyone,

I’m trying to learn how to extend the admin panel by adding new fields, I followed the documentation to learn how to create a plugin, and I looked at some existing plugin to understand the “event system”. This is very clear.
But regarding the page “extending”, I don’t really understand how to proceed, once I created PLUGIN_TEMPLATES/forms/fields/range/range.html.twig, I feel like I miss some information to fully understand this, as I’m still learning grav.
Do I need to add anything in mypluging.php ? In order to activate my fields.

Maybe it exists a very simple example on github allowing me to understand the way to do that.

And I be more then happy to contribute to the documentation of this topic.

Thanks a lot,