@Tattooed_mummy unfortunately it does not seem to have sufficient settings to do what I want - I want a sound to play at specifically these times:
09:50
13:50
18:00

With blip blip's options, you can set something like "chime on the hour between 10am and 7pm", but I can't find anything that would let me have it only happen 3 times a day at specific times I set.

(It is possible that these features are only in the next update - I have opted in to the beta, so once I receive that I can check)