Suggestions for a tree inside a splitter

I have to say I’m disappointed that ionic doesn’t include a tree component as a part of its framework. Many apps have a pattern with a tree on the left, then a splitter, then a content area to the right. Think of your favorite mail program.

I am new to ionic - and after searching a bit, I haven’t found just want I want. I’m going to play with angular/material mat-tree - but it lacks a lot.

I’ve read suggestions that we roll our own - make a list or accordion based tree as a component - but this seems like a lot of work that I would have hoped would come with the framework (as I said.)

Before I start rolling my own - I thought I would just ask for suggestions. Is there something I missed - or does someone have experience with something that worked well?

thank you very much - I appreciate any help!