Feature Request: imen index for code block with name

[ShuguangSun]

This is a feature request. The imenu index in the markdown has headers. Is it possible to add an option to put the code block with name to the index.

For example, I have a code blcok as "{r name, ...}", and I would like to have "r name" or "{r name" to the imenu index, would could help the navigation.