How does Xert account for resistance (and other modalities) training

Resistance training is an important element of an athletes training and can have significant induced stress, but I have noticed that Xert doesn’t recognize any activity other than cycling.
I can see that other modes of exercise, such as X-country skiing, being unrecorded stress during transition and early base. Doesn’t this skew the weekly stress that isn’t factored into training suggestions?

So, how do we help Xert integrate non-cycling workouts?