Templating: add to both top and bottom of the note from templates

Since Templating v1.2 we have triggers, and they require special line in frontmatter to turn on.

I have examples now when I want to include turning on a trigger from a template. This means having to use insertion at the top of the new note. But I also want to add some text to the bottom of the note as well.

I can think of two ways to extend Templating to achieve this, and maybe there are others:

1. Add a special syntax that adds a frontmatter field. If frontmatter doesn't yet exist then it will create it and then add the field and its value.
2. Add a special syntax that indicates material above is to go at top of note, and material below it at insertion point, or at bottom of file.

As far as I can tell from https://nptemplating-docs.netlify.app/docs/templating-modules/frontmatter-module this isn't yet possible, but I can't see into V2's documentation ...