The viewer is open source[0], so yeah you can embed it in an iframe (that's what the editor does), and just `postMessage` the parsed markwhen and some additional state to it. The structure of the posted data is here[1]. I'm happy to help, [email protected] or I'm in the markwhen discord[2]

[0] https://github.com/mark-when/timeline

[1] https://github.com/mark-when/view-client/blob/9eddc1a2cf79b4...

[2] https://discord.gg/3rTpUD94ac