Java/Gradle: Copy folder from external .jar dependency to own build resource folder

Question

Background

I have MaterialFX as an external dependency for my JavaFx project. The project tries to recreate the demo shown in the MaterialFX project. My project uses Gradle (build script in Kotlin).

The demo uses custom fonts provided in its resource path in a javaFxStylesheet.css file to style e.g. the JavaFX Labels:

/*javaFxStylesheet.css*/
@import '../fonts/Fonts.css';

.header {
    -fx-font-family: <fontname>`
}

where Fonts.css has multiple entries like

/*Fonts.css*/
@font-face {
    font-family: 'Comfortaa SemiBold';
    font-weight: 600px;
    font-style: normal;
    font-display: swap;
    src: url('../fonts/Comfortaa/Comfortaa-SemiBold.ttf') format('truetype');
}

Problem

The MaterialFX dependency I pull into my project has the used fonts in a separate folder but how to I use them in my project. As is visible from the demo Fonts.css (which I would like to simply copy into my project), the paths to the fonts e.g. url('../fonts/Comfortaa/Comfortaa-SemiBold.ttf') are specified relative the resources path.

Now, if I want to use the same fonts in my project without changing all the paths, I guess I need to

1. Copy the fonts-Folder manually from the externally pulled materialfx.jar into my own project resources
2. Have Gradle automatically do this

So I imagine I need something like the following in my build.gradle:

copy from external library 'materialfx-11.13.9.jar' the folder 'io/github/palexdev/materialfx/font'
    into my own projects "src/main/resources"

Note - there seems to be a smiliar issue but I can't make it work as I have no clue if it even aims at the same thing I'm trying to acchieve.