You might be interested in Ink and Switch's 'Inkbase' [1] concept. I'm not sure it's ready for Android tablets yet, but it seems to have a lot of potential for

You might be interested in Ink and Switch's 'Inkbase' [1] concept. I'm not sure it's ready for Android tablets yet, but it seems to have a lot of potential for 'programmable' ink like you're describing. [1] https://www.inkandswitch.com/inkbase/ https://www.inkandswitch.com/inkbase/