I don’t know what to write in the config where "dimension_name" and in what format

Hi :) As explained in the comment for the configuration:

Each entry needs to be formatted as dimension_name->aura_type, where aura_type can be any of naturesaura:overworld, naturesaura:nether and naturesaura:end, and entries follow standard TOML array formatting (https://toml.io/en/v1.0.0#array)

So for example, if you had a dimension whose registry name is dimension_mod:cool_dimension, and you want it to have the same aura as the overworld, you would put this as the value:

["dimension_mod:cool_dimension->naturesaura:overworld"]

Good luck!