Accessing HTML video Controls in a .md file

Hello !

I'm currently trying to embed a <video> using the media methods from Grav.
As for images, embedding them with

![on boarding](web_onboarding.mp4)
-```
works, but then the generated HTML is 

<video controls="1" alt="on boarding">
<source src="/vincentricard.co/grav/user/pages/03.case/01.ReadMe/web_onboardin g.mp4">
Your browser does not support the video tag.</video>

And I can't include the autoloop and preload that are supposed to be inherent to the <video> tag.

Has anybody any idea about how to include them?
I've tried

But it does not work.

I'd like to avoid writing proper HTML in my markdown :)

That's not currenlty supported. Please add a feature request here: https://github.com/getgrav/grav/issues