multiSchema variable

Hi all, im trying to use .env to replace schemas value

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
  schemas  = ["base", "transactional"]
}

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
  schemas  = ["base", "transactional"]
}

change to

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
  schemas  = [env("db")]
}

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
  schemas  = [env("db")]
}

but i got the error

Expected a string value, but received functional value

Expected a string value, but received functional value

env("db")

any idea for this?