Where is content impressions metrics in raw data

i can get raw data from matomo but i don’t see how to get content tracking impressions metric

Example extract:

<result>
   <row>
      <label>preview-diving-center - 4 Fun Diving Bali</label>
      <nb_uniq_visitors>10</nb_uniq_visitors>
      <nb_visits>10</nb_visits>
      <nb_impressions>10</nb_impressions>
      <nb_interactions>0</nb_interactions>
      <interaction_rate>0%</interaction_rate>
      <Contents_ContentName>preview-diving-center - 4 Fun Diving Bali</Contents_ContentName>
      <segment>contentName==preview-diving-center</segment>
   </row>
   <row>
      <label>preview-diving-center - Absolute Scuba Bali</label>
      <nb_uniq_visitors>10</nb_uniq_visitors>
      <nb_visits>10</nb_visits>
      <nb_impressions>10</nb_impressions>
      <nb_interactions>0</nb_interactions>
      <interaction_rate>0%</interaction_rate>
      <Contents_ContentName>preview-diving-center - Absolute Scuba Bali</Contents_ContentName>
      <segment>contentName==preview-diving-center</segment>
   </row>
   <row>
      <label>preview-diving-center - Alam Asmara Dive Resort Bali</label>
      <nb_uniq_visitors>9</nb_uniq_visitors>
      <nb_visits>9</nb_visits>
      <nb_impressions>9</nb_impressions>
      <nb_interactions>0</nb_interactions>
      <interaction_rate>0%</interaction_rate>
      <Contents_ContentName>preview-diving-center - Alam Asmara Dive Resort Bali</Contents_ContentName>
      <segment>contentName==preview-diving-center</segment>
   </row>
   <row>
      <label>preview-diving-center - Aqua Dive Paradise</label>
      <nb_uniq_visitors>8</nb_uniq_visitors>
      <nb_visits>9</nb_visits>
      <nb_impressions>9</nb_impressions>
      <nb_interactions>0</nb_interactions>
      <interaction_rate>0%</interaction_rate>
      <Contents_ContentName>preview-diving-center - Aqua Dive Paradise</Contents_ContentName>
      <segment>contentName==preview-diving-center</segment>
   </row>
...