API for bulk channel creation

I’m testing out the API to create Channels in bulk. I’m heartbroken to realize that channels don’t have codes like catalogs since I have to make over 2k of them. But I digress. I’ve create a channel successfully, but I don’t see the option to set the upload permissions upon creation. Please tell me I don’t have to do this manually. 😥

Adding upload permissions, which is visible when you search individual channels, still allowed me to create the channel successfully but didn’t set it to the parameter I specified. 

{
  "name": {
    "type": "single_value",
    "value": "Test",
"upload_permissions": "Experts only",
    "values": {
      "language_code": "en"
    }
  },
  "description": {
    "type": "single_value",
    "value": "test",
    "values": {
      "language_code": "en"
    }
  }
}