Adding a notes option in admin to put my coworkers initials next to a product they own

This would be important so that when we all have the exact same product we can fullfill the orders in the order that we added our stock to the website.

I might add 5 of the product on sunday and then my coworker might add 2 of the same product on monday, we need to put our initials to seperate our inventory.

Please advise, my website is https://shopheat.ca/ and I have the Dawn theme