I'm Ian, the Product Manager for Hubspot's Forms tool.
Thank you all for taking the time to submit, upvote, and comment on this idea. We hear you loud and clear, and we agree that this functionality is important. We are currently evaluating if this idea is feasible and, if so, how our team will implement it.
Any news about this feature request will be relayed on this thread, so stay tuned!
Support for deal properties in forms is definitely something we want to look into. But for now, we are not actively looking into building this due to other priorities. We will review this again later this year.
Upvote! I want to create a form for my customers and incorporate information from their Deal. For example, sometimes we are missing information to take customer to the next step. I would like to use Workflows, have a trigger for missing Deal information, and then sends the customer an appropriate form to fill Deal Properties.