Not possible to set tags containing comma ',' or closing bracket ']' in command line with -g option

[tequilacat]

When using -g option, comma in a tag text within [] causes "Warning: tags format ambiguous !" and the tag is truncated.
Example: -g [@t=This, cannot be a title]

Very briefly looking at splt_tp_parse_tag_word() in tags_parser.c, I don't see any way to escape special characters like comma and closing bracket.

Is there a way to use external file to set tags, or escape special characters?