Currently, it is possible only to search via JQL for a specific word on a comment.
Comment ~ "\"#jira\""
As a user, I would like to get the metrics of the hashtags that I use (both JIRA and Salesforce Comments). For example:
# (count of) of times used (unique comments created)
# (count of) of unique jira ticket #'s the # comment was applied to
|Hosting platform||Cloud, Server, Data Center|