How to include custom Icon-Sets with Vaadin 14.3.0

Hello,
how to include custom Icon-Sets with Vaadin 14.3.0? I tried [this]
(https://vaadin.com/forum/thread/17772875/17773302) and [this]
(https://stackoverflow.com/questions/52110040/how-to-include-own-icon-collection-in-vaadin-flow), but none of this worked.

My state now is from the Answer in Vaadin Forum (first link).
[My JS File]
(https://1drv.ms/u/s!Av_-QrTeJXiQnM91Q_eBilR6Ckar7Q?e=mGT6AO)

[The Enum File]
(https://1drv.ms/u/s!Av_-QrTeJXiQnM9z9IYJLRhZGA_vxQ?e=IFOENy)

[The View I am using it in]
(https://1drv.ms/u/s!Av_-QrTeJXiQnMZ1t4p4Oj25iql1pQ?e=WUPY5f)

I hope I can a solution can be found.

Best Regards
Mats

NOTICE: the links to my project files expire on 30.07.2020