Two fields to be added in the webinar without registration

[AslamAION0606]

Hi Everyone,

I have a situation where customer has scheduled a  webinar. 

Issue : Customer wants their participants to join their scheduled webinar without registration. However, they want to add two more fields like EID, email id while joining that webinar.

May I know is it possible? 

As far as I know only in registration page we can add fields. Please help me if there is any workaround for it