Add rice, broth, carrots and corn to the Instant Pot. (Leave peas out, but let them thaw on the counter as the rest of the food cooks in the Instant Pot) Put chicken in the Instant Pot and push it down into the broth. Secure lid. Turn nozzle to sealing. Cook on HIGH pressure for 25 minutes. Once cooked, switch vent to quick release and allow all of the pressure to release. Remove lid.
Take chicken out of the Instant Pot and shred or chop the chicken.
Add chicken back in to the IP, along with the peas.