This isn’t quite what you want, but you can transclude headings or blocks.
For your example, you’d have something like
The powerhouse of the cell.
Add more content
^block-id
Which you’d then reference like this
> Note to self:
> ![[NoteToSelf#^block-id]]
Which would display as
> Note to self:
> Add more content
This is more a workaround than an actual solution to what you’re looking for, but it may be sufficient if you can’t find what you’re actually looking for.