As you can have only one journey, if you select a new one, the progress for the existing is gone.
I’m just guessing, but I will try to answer from my own coach’s perspective.
As you said, you are expecting a plan which makes sense to your goals. So what would be your primary focus with weights and running?
Are you trying to build muscles and want some cardio involved? Or a runner who wants to gain muscles for technique improvement?
From these two questions alone, plan will look different and will be even more complex with other things involved and keep in mind this is still a AI.
Meanwhile since there is no coach combining what you are looking for available my advice would be:
What’s the most important thing for you and
Select the journey accordingly. Then either pick separate workouts or exercises.