I think adding some sort of CTA “action type” is a good idea. There is a decent amount of overlap in this post: sRFC 32: Optional Transactions in Action Chaining for the implementation of something like this.
What type of CTAs do you think would be useful? The only one I can really think of is a link that should open a new tab for the user.
For user safety, should there be any restrictions on what websites can be linked to? Or would be displaying the domain below the button be sufficient enough