I can't make a custom biome in a custom dimension an actual ocean

I use Misode to generate a dimension named "antiqua". I also used Misode for its biomes, noise settings, etc. I used the presets of ocean, desert and birch forest biomes and just renamed them a2, a3 and a1 (a2 being the ocean). I did the same thing with the dimension and typedimension files. My problem : in my dimension "antiqua", a2 is just a plain biome, so I can't use it (I need it to be a real ocean biome to genrate structures later). I think it's because of the noise_settings, because for the desert biome "a3" I replaced all the "minecraft:overworld" with "antiqua:a3" and it worked. I can't do the same with the ocean biome, because there is no part of the noise settings file with "minecraft:ocean" to replace. Could you help me please? Here is my noise_settings.json