Interesting idea. The AppSchema intents have an additional parameter.

To extract a text representation is the only solution to scrape the DOM using a JavaScript evaluation? Or is there a better approach to forward the content into an IndexedEntity?

I should add that I realize that it is possible to avoid the duplication in Shortcuts by marking the new intents as "AssistantOnly", but that is not great because would force Shortcuts users to stay on the legacy AppIntents. The best would be a migration mechanism to convert any automations the user set up to make them use the new AppSchema intents. Is that feasible?