Does asymmetric rim go with dynamo hub?

Asymmetrical rims raise the weaker side tension and reduce the bracing angle disparity on wheels where the hub has a different center-to-flange distance on each side, as long as the amount of offset at the rim in question brings the dish closer to center than the offset at the hub moves it away from center.

SON28 disc hubs have smaller and closer to symmetrical center to flange numbers than most disc hubs. As you can see in the numbers from Schmidt's site below, the difference in center to flange is only 2.5mm for 6-bolt and 2mm for centerlock.

Therefore, you have to be careful with the golf-ball type generator hubs about not running into the mostly fringe situation of an offset rim doing more harm than good. You (or at least I) really need to run the numbers to figure out if it's beneficial. We'll use a WTB 29" Asym I29 with its 4.5mm of offset to demonstrate, with the KOM Light to compare with. Being able to do this easily is one of the reasons the nerdier spoke calculators are superior. I will use SpoCalc here.

6-bolt SON28 with WTB Asym I29 29":

6-bolt SON28 with WTB KOM Light I29 29":

Centerlock SON28 with WTB Asym I29 29":

Centerlock SON28 with WTB KOM Light I29 29":

130%-ish is further away from 100% than 91%-ish, and the bracing angles are way less disparate on the KOM. So in none of these example cases would 4.5mm offset be beneficial. It would be all downside. You'll need to do the math yourself for the parts you're using, but among contemporary mountain asymmetrical rims this is probably about what you'll see with the SON28 in particular.