I have the same issue and will probably just include an LOE for the same.
Source:
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/medical-police/police-certificates/how/qatar.html
If you are not a citizen of Qatar
If you live in Qatar: (for more than 6 months)
You must apply in person OR ask a representative (a friend, relative or colleague) in Qatar, with a power of attorney, to apply on your behalf, and bring:
- Two photographs (4x6 cm)
- A copy of your current passport and ID card
- A copy of your residence permit
- Applicable fees
Basing from this, a visitor would not have a residence permit so let's just do our best in explaining the situation in the letter.