Nested labels not possible?

First post here - so thanks for TTRSS which helps a lot to deal with massive amount of articles. Wiki and forum search did not show any relevant answer to my problem.

Nested feeds are possible by using categories which itself can be again nested in other categories. While I appreciate its existence I only use this tree view for maintenance aspects for a growing number of feeds, not for reading.

As my filtering ends up in topic labeling, my question: is there any way to also nest labels in main label groups and sub label groups? It would make it way more convenient than scrolling through a looooong list.

Thanks in advance for your time.

PS: I have an Information Retrieval background and try to setup a free system for a NGO here in Berlin. Therefore I cannot create plugins. The final server should have git access, I am only creating a prototype.

tt-rss version (including git commit id):
18.12 (shared hoster with one-cllick-installer and without git)

Platform (i.e. Linux distro, PHP, PostgreSQL, etc) versions:
MySQL 5.7.25-0
Ubuntu 16.04

no, you can’t nest labels. if you want nested structure there’s categories. everything else (labels and tags) is flat.