public IReadOnlyList<CIMKnowledgeGraphQueryDefinition> GetAllQueryDefinitions()

{
  // access the currently active knowledge graph investigation view
  KnowledgeGraphInvestigationView activeView = KnowledgeGraphInvestigationView.Active;
  KnowledgeGraphInvestigation investigation = activeView?.Investigation;
  if (investigation != null)
  {
    await QueuedTask.Run(() =>
    {
      // get all the query defintiions
      var queries = investigation.GetAllQueryDefinitions();

      // get a specific query definition
      var myQuery = investigation.GetQueryDefinition("Query1");
    });
  }
}