I had the same problem, and this is what I did.
1. Edit your website page or landing page in HubSpot. Now add a Rich Text block, which you would find under Common Modules.
2. Next, you would edit this block, and go to Advanced → Source Code on the top-right corner of the screen. This allows you to add custom code to your Rich Text block.
3. Paste the source code from Jotform
