Setting the value of an input in the parent window (the LP Editor) using JS on the page itself

[Thorsten]

Hi everyone,

I am using a custom namespace in my (guided) landing page template. Is it somehow possible to leverage some of it in the landing page editor as well?

It seems like it's not even possible to do a 

var td = {};

Is the editor filtering this out?

My goal would be to auto-fill a string template variable with the landing page URL and adding some UTM tags, which will then be used as the OG URL when sharing the page, so it's rendered with the page already.

Kind regards,

Thorsten