Custom dimensions - Not appearing in the dashboard?

Hey guys! First time user here!

So far, we are playing around with the on-premise version of Matomo. I have one question and I hope you can help us to understand:

I am sending custom query args to the matomo.php from our game. E.g. matomo.php?health=70&…

It seems that - despite adding a custom dimension for health - this parameter is not processed. Are we missing something?

Is there a way or a plugin to see these additional parameters when hovering options in the dashboard? For example, a user enters a room, an event is being sent:

ROOM_ENTERED (health=70, shield=20)

The event is being shown in the dashboard, but when I hover it, it will only show the ROOM_ENTERED, not the other parameters.

Do we have to create a plugin for this use case? Or will it work once we set it up correctly?

Thank you so much in advance!