How to user script to get RFx owner Email Address in RFx response page

Hello, expert

We want to user srcipt to get RFx owner Email Address in supplier resopnse page that supplir can send the emai to the RFx owner.

But I do not konw how to get it ,the API can only get the current user information.

Could your expert please provid a solution to us for it..

Thanks.....