Print layout in print setting - How to use? (dt 3.8 / Arch Linux)

Hi,
I am very happy about the great new version 3.8 and discover new features in all corners.

In particular, the function that multiple images can be freely placed on a page when printing is really great.

Now I’m trying to adapt this for myself, but I don’t know if my plan will work at all.

My problem:
I have a large amount of LUTs that I have exemplary applied to always the same, duplicated image to get me in the lighttable a quick overview.

To simplify it and to be able to send it also image style examples simply by mail, I have set up a virtual PDF printer in my Arch Linux and have me in landscape format 4 image areas set up and saved as a preset.

My first question: how do I tell darktable in the print module to always use this one preset for the layout by default?

My second question: is it possible to automate the filling of the image areas? I had understood that I select a number of images in the lighttable, then switch to the print module and the selection of images is automatically inserted into the preset I previously defined as the default layout.

My third question:
In this overview I would like to get the file name for each image and the name from the duplicate manager. For this purpose I thought of a style preset for the watermark module that I create and use in the print module.

Is there a variable that gives me the name from the duplicate manager and that I can use in the Watermark module? In the manual I could only find these variables:

https://docs.darktable.org/usermanual/3.8/en/module-reference/processing-modules/watermark/

Regards,
majobu

I can answer my third question about the appropriate variable myself.

$(VERSION_NAME)

This variable comes from the general variable overview:
https://docs.darktable.org/usermanual/3.8/en/special-topics/variables/

But it also works for watermarks.