After getting records from another entity, I want to show it in IFRAME or websource?

Hi,

On form properties of entity case, able to get details from Account entity and fill it in this entity by creating same fields(odata & web api). Instead of creating new fields ,I want to show on Iframe or websource like form of table ? Can I have sample examples for CRM 2016? OR How to pass JSON to web source in order to show data?

Thank you

Deepthi Thotakura