Obsidian has no syntax to embed a note’s outline, but a simple embedded search can list a note’s headings, and you can click or tap to visit them.
To list all the headings of a note named “Example”:
~~~query
File:"Example" "## "
~~~
That searches (in the specified file) for 2 # followed by a space, which matches the end of any heading marker except a level 1 (which is commonly only used for the document title). (It could match other things too, but it’s unlikely.)
You can filter out subheadings by using a regular expression.
To show only level 2 and 3 headings:
~~~query
File:"Example" /^###? /
~~~
Or only level 2:
~~~query
File:"Example" /^## /
~~~
The regular expressions mean:
- “Starting at the beginning of the line (
^), 2#, optionally followed by another#(#?), followed by a space”. - “Starting at the beginning of the line (
^), 2#followed by a space”.
By default, embedded searches look like the sidebar search widget, including a yellow highlight on all matched text. I use CSS snippets to make it look more like normal text, as seen in my screenshots (the amber color is from an unrelated CSS snippet).