Soak dried chickpeas for 5 - 6 hours in 2 cups of water. Skip this step if you are using canned or pre cooked chickpeas.
Make a smooth blend or paste of fresh tomato, ginger, garlic, and dried red chilies using hot water. Keep it aside.
Set the SAUTE mode of the instant pot for 5 minutes.
Add oil to the inner pot. Once hot, add cardamom, bay leaf, and cumin. Saute for 40 - 50 seconds to release their aroma.
Add chopped onion, and fry till light golden.
Add the tomato paste prepared earlier, red chili powder, turmeric, corriander powder, and salt. Saute the masala for 3 - 4 minutes.
Add soaked chana (chickpeas) and 1 ¼ Cups of water. Stir to combine. Close the lid of the instant pot. PRESSURE COOK for 20 minutes.
Release the steam manually. Check chickpeas for doneness. Add garam masala, coconut milk, and spinach leaves. Stir to combine. Set the SAUTE Mode for 5 minutes to simmer the curry. Taste and if required, add more salt.
Serve chana saag with rice.