How to distinct PL, PETs and EVT element in payload of fields

In service configuration with postMessage is get payload with objects as array of PL. PET and EVT fields. Example payload (shorted) is on bottom of this post.

How to distinct EVT list of other list? Maybe if is last in array and first field name doesn't end with "RIID"?

Maybe it can be defined in field "type" of each element, but "type" is always "Standard".

{
   "objects":[
      {
         "name":"Infobip_1_list_load_test_Croatians",
         "type":"Standard",
         "fields":[
            {
               "name":"RIID_",
               "dataType":"Text",
               "width":0,
               "readOnly":true,
               "format":null
            },
            {
               "name":"CREATED_SOURCE_IP_",
               "dataType":"Text",
               "width":255,
               "readOnly":true,