How to add music note to lyrics?

[zhouhao27]

Here is the document:

Bark can generate all types of audio, and, in principle, doesn't see a difference between speech and music. Sometimes Bark chooses to generate text as music, but you can help it out by adding music notes around your lyrics.

It mentions users should be able to add music notes around the lyrics. But how to do it? Is there any document about it?