Guide High Five [Help] Adding Custom quest to .dat

I currently have a working custom quest, but the problem is that I can't see it in the game's quest log. I've added it to questname-e.dat, but I still don't see it. I think there's another file where I need to add it, but I can't find it. For the items and skills I've added, I've always put it in the name and grp fields, but there's nothing related to questgrp.dat in the quest log.

Could you tell me where I can add it?