Can we access element within Jitsi Meet external API iframe?

I am trying to access the text boxes inside the jitsiconference frame when using the Jitsi External API.
I see there is a way to get the iframe as
const iframe = api.getIFrame();
Can I access other elements of this iframe and set values for them?
For Example: Username and password textboxes.
I want to find these elements and set values in those textboxes. These elements are not accessible because of cross origin iframes, but I guess if the api allows to do that then we can do that.