Iframe for video link saved as a entry

Hello, I am new to Grav and I was looking at the content option in the backend and what I miss is the ability to place a iframelink that is not in the content section but kust underneath the title. I have a template that uses images and/or a videolink above the content and not inside the content. but I want the ability to save it as a post with that iframelink. I hope I have made myself clear on explaining this, but just like the image separated from the content I would like to see the same for a iframe link and not alter it in the html file itself.

I embed some videos as iframes in my articles. I define the YouTube Video ID in the frontmatter of the article and I check if page.header.youtube is set within the template and if so, I embed the video.

I hope it helps.