MultiMarkdown Composer lets you add HTML elements alongside your writing. This means you all add id="" tags to your content. And, that to me, seem very close to Roam’s UID blocks.
When I add images to my documentation, I’m able to add the alt="" tags while I write, which also saves time and helps me avoid forgetting to add them when I publish.
I so so so want Obsidian to make multimarkdown an option. If not, I have to figure out what to do about all my now broken content written in multimarkdown and markdown.