I wasn't aware of furigana. I should be able to add that as an option if I can find a suitably-licensed dataset.

There seem to be some browser extensions that specialise in adding furigana to existing text, so you might be able to layer that on top as a temporary solution. https://chromewebstore.google.com/detail/furiganator/ijfcmmk... works for me, but you have to click the extension icon first.