1) As a user, I would like to search on hashtags that exist in included markdown documents or that I might add to Brain notes. Currently special characters like # are stripped out of search

2) As a user, I would like hashtags to work interoperable with Tags. Any found hashtags would show up in the Tags menu. This would greatly increase interoperability with other markdown tools

One of many forum threads
https://forums.thebrain.com/post/is-there-a-future-for-hashtags-7444-11119130?highlight=search%20hashtags&trail=30