How to Make It
Combine broth, beans, lentils, 2 cups water, onion, carrot, Parmesan rind, garlic, thyme, pepper, salt, and bay leaf in Instant Pot. Cover with lid, and turn to manual. Turn lid valve to seal, and set to high pressure for 15 minutes.
Release valve with a towel (be careful of the pressurized steam), and release steam until it stops. Carefully uncover, and add chard and lemon juice. Stir until chard is wilted, about 2 minutes. Remove and discard cheese rind and bay leaf.
Divide soup evenly among 6 bowls. Sprinkle evenly with Parmesan.