How to send byte array (Blob) to GraphQL mutation

问题

We have a GraphQL mutation with a byte array (Blob) field. How can I use tools like Insomnia or GraphQL playground to send byte array data to test the API?

mutation {
  saveSomething(something: {
    contentByteArray: [97, 110, 103, 101, 108, 111]
  }) {
    content
  }
}

来源：https://stackoverflow.com/questions/57446927/how-to-send-byte-array-blob-to-graphql-mutation