In the example I posted, the todo’s block ID was randomly generated. You can also append your own to the end of a line. ^likethis
I could then write ![[this note#^likethis]]* to get at it, and you can use custom IDs to infer what the item contains while in edit mode.
(*incoming syntax change for block as we experiment in Insider: the links will soon require #^ instead of just # so that they’re more apparent and block IDs are more easily searched, among a few other benefits; thanks to Insiders for the feedback!)