...and i cant figure out what i'm doing wrong.

Using this potentialspawn.json to make parrots and ocelots to spawn in other biomes beyond jungle.

Minecraft 1.12.2, Forge 14.23.1.2600 and incontrol-1.12-3.6.5

You're not doing the "Mobs" block:
{
"dimension": 0,
"mob": "minecraft:ocelot",
"biome": [biomes]
"maxcount": "10,minecraft:ocelot",
"mobs": [
{
"mob": "minecraft:ocelot",
"weight": 5,
"groupcountmin": 1,
"groupcountmax": 2
}
]
},

I recommend to put a maxcount ALWAYS, otherwise they might spawn to death....

Thanks for the help!