You can submit screenshots of job searches, screenshots of home-rental searches if you can communicate with several home owners you can have screenshots for that, you can also post online ad looking for a house/apartment etc to rent from (eg) Sept 2021, take a screenshot of that and submit.
You can have family/friends write letters that they know of your plans to move back to Canada once PR is approved.
If family/friends will be helping you once you move they can also write letters for this; let’s say you will be living with your family once you return to Canada until you are able to get your own place.
You can also include search for insurance plans