You could setup some sort of form they could fill out. I have a google forms for simple stuff (I know not self-hosted), but you could self host one (or make one) as well. Again, I think nextcloud has a forms plugin, but you could use something like Budibase. Their screenshots even mention ticketing lol. Easiest way to do this imo since your folks will just go to the site with the form, add a description, click some boxes and then you'll see them later.
I've only done basic stuff with Budibase (over kill for what I needed), but you can just slap it on a docker container.