A few years ago, we used a Discourse plugin to embed HedgeDoc pads into a Discourse instance, when their URL matches a certain regular expression.
The plugin is very simple and could easily be adapted to allow embedding a Grist database into this or any other Discourse. This could make explaining concepts easier, as the explanations could be shown right next to the interface they describe.
A little addition could be to make the URL/regular expression configurable in the admin backend.