org.eclipse.mdm.nucleus/org.eclipse.mdm.application/src/main/webapp/src/app/navigator/nodeprovider2.json

{
  "name" : "Channels",
  "type" : "Environment",
  "children" : {
    "type" : "Test",
    "attribute" : "Name",
    "query" : "/tests",
    "children" : {
      "type" : "Channel",
      "attribute" : "Name",
      "query" : "/channels?filter=Test.Id eq '{Test.Id}'"
    }
  }
}