Hmm, so if I slightly modify your example:
- [[My Project]]
- # New Topic
- Lorem Ipsum
then it basically “pushes” this content into the Linked Mentions of [[My Project]] currently (in the latest version). What you’re asking for that’s not currently in the SB feature set:
- boundary definitions with
[[...]]to define the block (an outliner like LS implicitly defines the block to be all children, which SB can’t quite do) - live editing of the transclusion (but I see this as a different issue – the fundamental concept of live editing doesn’t exist in SB)
Are these what you’re suggesting?