Hi Danny,
I've been banging my head for a while on how to achieve this, but no luck so far. I believe we're likely trying to achieve the exact same thing here. Possibly even with the same kind of data. Just out of curiosity, would you ever have more than one parcel selected at once?
I may have found a potential solution. Although, I haven't tested it yet and I'm not fully sure if this would be easy to achieve if you're having various parcels selected at once.
This would bring us back to using the content of a pop-up, as previously suggested, instead of struggling with dynamic text. Here's the example: Solved: Printing Popup Contents - Esri Community
The pop-up would work as the box itself, and the dynamic text would be the pop-up content. It'd change automatically as you either manually select a feature or select it by querying it through a search. As far as the title of your exported map being populated by the ID from a selected parcel, I'm not fully sure. Though there must be a way!
Like I said, I haven't tested it yet, but the discussion in the topic apparently lines up with what I'd like to achieve. I am not versed in PY at all unfortunately. Therefore, I'll likely have a learning curve to overcome here.
Let me know if this is what you're looking for, or if I can help with anything. It's always great to share ideas/findings.
