Topic prefix for forum RSS feeds?

[Millipede]

In Forums > RSS Feeds, you can set a topic prefix. How do you get this prefix to show as a badge and not just as simple text words?

[opentype]

You can’t. It’s just text added to the title. 

[Millipede]

Oh. That's a shame. It looks so old-fashioned having the prefix look like that, eg, if you were to put the prefix inside square brackets, so's to show it's a prefix.