User-templated text for rich presence caption

[CallyyllaC]

Ability to change the long and short text in discord

eg. "▶MyArtist" could be changed to "Artist: MyArtist" by allowing the user to use custom text with variables "Artist: {@artist}"

Changing 01x04 to {@disk}x{@track} or something?

and perhaps being able to toggle between time done and time remaining?

[rg9400]

Along with this, it would be nice to have tokens for elapsed time and total time, so it can give a caption like 21:42/43:04 for an episode for example.