Hello @Siegfried Baldauf,
Thanks for the message.
First of all, to obtain the UVs info from your mesh, you'll need to use Substance Baker (right click on your mesh > Bake Model info).
Then Add a Baker, chose Convert UV to SVG and switch the color mode to Uniform. This way you'll be able to import the UVs in a SVG node.
You can now turn this SVG into a gradient (with a bevel node, or anything of your choice) and use it as a Scale Map in a Tile Sampler.

Tell me if you need anymore guidance.