Markdown card


can someone explain to me why the following code won’t work?

I have installed the f1 addon in my home assistant.
Now I want to add the following code to the markdown card.

<img width="100%" src="{{|replace(' ','_')}}_Circuit.png.transform/7col/image.png">

It must show the f1 circuit but I don’t see any image.
When I put just <img src=""> then I see the flower image.

What am I missing or doing wrong?