Hi @lokeshpatel
You want to parse the owninguser field since the expand brings the field over as a JSON object.
You can use a Parse JSON action and use this expression in the Content input:
first(outputs('List_records')?['body/value'])?['owninguser']
What I did was run this with Schema as {}
Than copied the JSON from the run and used Generate from sample to create the schema

Doing this, you will be able to reference the values inside the expand query