Dynamic data sources

// MiniApp root level
source: {
  // Each key must start with "rpc_"
  rpc_channels_list: {
    url: 'https://slack.com/api/conversations.list?limit=1000&types=public_channel,private_channel',
    method: 'GET',
    headers: {
      Authorization: 'Bearer [[accessToken]]',
    },
    dataPath: 'channels',         // JSONPath to the array in the response
    valueField: 'id',             // Field to use as the option value
    labelField: 'name',           // Field to use as the option label
  },

  rpc_users_list: {
    url: 'https://slack.com/api/users.list?limit=1000',
    method: 'GET',
    headers: {
      Authorization: 'Bearer [[accessToken]]',
    },
    dataPath: 'members',
    valueField: 'id',
    labelField: 'profile.real_name',  // Supports nested paths
  },
},

// Then reference from action parameters:
actions: [{
  parameters: {
    properties: {
      channel: {
        type: 'string',
        title: 'Channel',
        'x-source': 'rpc_channels_list',  // ← Matches key in source
        'x-fallback': 'input',
      },
    },
  },
}]