There is no reason why you can't add cheese to quinoa. Actually, it probably enhances it nicely. In the following preparation, you mix quinoa with carrots and cheese.
Put the instant pot in mode browning
Fry the onions and carrots
Add the quinoa and broth
Switch the instant pot to pressure cooking mode 6min
At the end of cooking, add the cheese
Leave the instant pot closed for a few minutes to melt the cheese
Servings 2