custom query for fetching active alerts

 I am trying to query the below parameters (Active Alarms , relevant Node details , its Severity and Region etc.) ...From the documentation active alerts can be fetched from this details 

[Orion.AlertActive ] 

in the above table , i am not able to query relevant node details , severity ,, can some one help me which this creating custom query fetch these properties [Active alerts , respective node id , alert severity , and region ]