Salesforce Generic SOQL query

When you run the pipeline - what is the format of the payload you get back from the query? If you look at the logs - you should see the raw output of your query. You would base your next steps on that. If the payload response is JSON for example - then you can just do bracket or dot notation to access the data. 

So in future steps you can just do like {{a.data.key}}, {{a.key}}, {{a["data"]["key"]}} - whatever the JSON structure is like and target the key value pairs that you need.