How to prepare the schema for Variant Enum like this

[JustinMaDev]

Hello everyone, I have a Variant Enum in Rust like this:

#[derive(BorshSerialize, BorshDeserialize, Debug)]
pub enum TokenInstruction {
  InitializeMint,
  Mint { amount: u64 },
  Transfer { amount: u64 },
  Balance,
}

InitializeMint and Balance do NOT have any member, but Mint and Transfer have a u64 member, I am confused and don't know how to prepare the schema for this kind of enum.

Thank you so much.