Your comments

I did eventually realise I could see more once I had purchased the app rather than using the trial.

Yes you can view the User Note.

There is no import or equivalent to GSAK User Data field.

Seems to be no searchable fields outside of standard GC fields.

Only the cache name is searchable by text entry.

Response didn't really answer was it possible to include a field such as the GSAK UserData and have the contents of that field searchable by part contents text entry.