This is only a SWAG:
It may be associated with your W-2 form.
If not, it could be associated with a different income reporting form. You may have to search, or wait for someone more knowledgeable than me to respond.
Alternately, you may check Leonard's response to this older question
https://ttlc.intuit.com/community/tax-credits-deductions/discussion/how-to-claim-a-tax-treaty-with-t...
Or try GOOGLE "turbotax tax treaty" (don't use the quotes in your actual search)
You could also include the country in your GOOGLE search.
I hope this helps.
**Say "Thanks" by clicking the thumb icon in a post