Can you make water mobs spawn in the forest biome?

Trying to make any water mob spawn in forests. 
My datapack replaces all air to water. I've tried putting both of these in worldgen/biome/forest.json  "spawners" category which did not work:
      {
        "type": "minecraft:squid",
        "maxCount": 4,
        "minCount": 1,
        "weight": 2
      }
    ]```

```"monster": [
      {
        "type": "minecraft:drowned",
        "maxCount": 1,
        "minCount": 1,
        "weight": 100
      }
    ],```