how to generate mushrooms underground

just for testing purposes, ive set sea lanterns to spawn on the floor of my caves with a placed feature json so i can make sure theyre generating in the right place and with the right frequency. however, when i switch feature from "type": "minecraft:simple_block", "config": { "to_place": { "type": "minecraft:simple_state_provider", "state": { "Name": "minecraft:sea_lantern" } } } }, to minecraft:huge_red_mushroom nothing spawns. shouldnt the big mushrooms from the mushroom fields biome be spawning in place of the sea lanterns? thanks for any help<3