Don't show internal section headings in global TOC

[infinity0]

Suppose I have a page like:

==========
Chapter A
==========

.. toctree::
   :hidden:
   :glob:
   :maxdepth: 1

   a/*

Intro
========

Introduction text

Terminology-wise I'll refer to Intro as an "internal" section heading as this is defined on the same page, and a/* as "external" section headings as they are defined on subpages.

Currently sphinx-material in the global TOC renders all the subsection headings a/* plus Intro directly below Chapter A in the tree, as per what the above syntax defines. In the local TOC however, this renders just Intro directly below Chapter A, i.e. only the internal section heading.

I would like to omit rendering Intro (i.e. the internal section heading) in the global TOC, and only render external section headings, however I couldn't figure out how to change globaltoc.html and localtoc.html to do this. Clearly there is some way of distinguishing the internal vs external section headings, could you please advise?