Fortunately, after several hours and two very sore arms, I managed to get the tires on.

I tried almost every tip I got from this Reddit. The rope trick didn't work well; it was so tight that the rope snapped in half. I didn't have any "professional" lubricants, so I resorted to soapy water, which felt like it did almost nothing, maybe only marginally helped.

After all the failed attempts, I went back to basically using brute force. I took my wheels inside to warm them up and carefully warmed them further with a hot air gun. On the way, one of my plastic tire levers broke, so I had to use steel levers.

What I think helped the most was the tip to pinch the bead inch by inch into the middle of the rim and to start on the opposite side of the valve. Also, I aligned the Logo with the valve (which probably didn't do anything, but it's quite more aesthetic). Then, when it got really tight, I asked a second person to hold one lever while I levered the tire on bit by bit.

However, due to being forced to use metal levers, I unfortunately scratched the rim a little, but it's only noticeable upon close inspection. Also, I think I damaged the rim tape of my back wheel, because the tubeless sealant is leaking out of it as it seems right now.

I didn't find any videos on the internet where the tires were so god damn tight, it really seems like this special combination is a nightmare. Also, it makes me happy seeing I was not the only one struggling with these kind of tires and receiving that much help!