txt files allow comments, but whether it is #xxxx or #xxxx#, I cannot remove the comment content when automatically completing the tag.

[1025307336]

If you want to have autocompletions for word lists (such as anime booru tags), you can! You just need to set it up first:

Find a word-list file. There are several here you can use.
Any will do (if the word is the first entry per row). Optionally second column can be an ID number 0-5 for unique colorations to distinguish categories..csv
or files (for newline-separated wordlists, allowing to mark comments)..txt#

How to use the # comment in the Autocompletions instructions?

[mcmonkey4eva]

If you want a comment you can

# some not used text
actualword
otherword