Hi Mala,
here is another option.
Cut out section where the twist is required
.Select corresponding edges and copy to create curves to blend,
Use the blend curves as guides for sweep.
Cheers
Barry

Hello supporters,
Thank you very much for your principles and ideas.
In principle, the solutions show something of what I wanted to achieve. When I look at it this way, I realize that it looks different than I had imagined. The closest is the last option from Barry-h. (even though I don't quite understand the workflow yet). Because there, the axial rotation happens over a long distance. I need to try it out some more and tinker with it. I'm still too far away from the ideal design.
Best regards, Tom

Hey Tom,
Here is a short video showing what Barry is describing. I couldn't tell whether you wanted the twist to be longer or shorter, so I took my file and created a shorter "harder twist"..

It should explain what is going on and how he described to generate the curves for the twist sweep. If you wanted the twist to be longer, You would do it over a further distance... This should have it make sense.