Not sure if wildcards is the right word, but i am playing with Butler automations to create my own "done" button based on a tutorial i saw, and for the most part it is working.
I would like to change the card title to retain the same text but show as striketrhough text.
I tried changing the title to ~~{cardtitle}~~ and while it does dynamically extract the card title, the strikethrough formatting does not take effect.

What am i doing wrong, or is this not supported?
Thanks