Feature request: `%tags%` Variable

[infinitelyintrigued]

I use Thunderbird tags to categorize emails. I would like to see a variable (e.g., %tags%) to embed assigned tag names in templates (e.g., tag1,tag2,....)

It would also be great if the variable can do pattern matching optionally (e.g, %tags("pattern")% for matching and %tags("^pattern") non-matching) to include and exclude some tags.

I use the same tag names in other applications that have their own email addresses. Being able to tag reply and forward messages will be a great time-saver.

Thank you