Heading heirarchy in GFM files

[mangecoeur]

I was hoping to use symbols-tree-view to give an outline of a markdown document. While it correctly shows every headings, it doesn't seem to show the heading hierarchy (H1 contains H2 etc). Heading levels are defined using #=H1, ##=H2 etc...

If I understand correctly this information is extracted using ctags, though I'm not very familar with that nor how one might override the default.