automate close shapes placement of boundaries + periodic boundaries

[Basilisvirus]

I hope this is a valid request. I was watching this video: https://youtu.be/ScwGM_HE8LQ?si=DHe-u4GmHUF6jNCr&t=292 . From 4:52 onwards, would it be possible to have some kind of automation to detect close shapes and place boundaries there automatically?

Same goes for this process to be automated?: https://youtu.be/ScwGM_HE8LQ?si=ZE_p5CI2iW7X-zbc&t=592