Founder here. Docs where just updated to answer your question broadly (https://docs.isomeric.ai/api-reference/prompting)

In a nutshell you prompt the Isomeric LLM with the format of the data you want to see. This way you can completely control the output. We have support for even finer grained control through things like regular expressions too (https://docs.isomeric.ai/api-reference/prompting#pattern).

As for canvas. No, only text can currently be ingested.