Back in the Google+ era of online gaming I developed a Hangouts plugin called RPGHUD that worked as a dice roller that would overlay the results in a visual form on top of your video feed so people can be "heads up" looking at your dice while they're looking at your video feed rather than looking down at a map-based VTT or over at a chat log or whatever. Google end-of-lifed the API that made it possible so I thought the tool was dead, but recently I decided to try to resurrect the tool for the Zoom gaming era. As far as I understand things there's no way for regular people to create their own Zoom filters, but OBS (the software that most video game streamers use) has a mode where it "streams" to a virtual web cam that you can tell Zoom to use as an input, so this new version is just javascript and HTML and you configure OBS to display the page with the dice results on its internal browser and overlay it over your normal webcam. If you are interested in trying it out there are instructions here: danmaruschak.github.io/RPGHUD/ (I'm treating this as an alpha right now, i.e. I think it has all the features in needs to work but I won't know for sure until some more people try it).