Traditionally, that's done with microphone management. You can whisper or present sotto-voce, but do it really close to the microphone so you sound close and intimate at normal speaking volume. You can yell, too, but yell off-microphone, so the timbre of your voice is yelling, but the volume doesn't go up.Do you have any words of wisdom about how to go about these sort of chapters
Oh, and while you're in close, take care not to pop your P's. Since the whisper voice is intended to be slightly unnatural anyway, talk across the microphone rather than directly into it.
Until you get good at it, you'll need to see the volume meters and script at the same time. After a while you just know. This is also where good, real-time headphones come in handy. You can hear your volume adjustments as they happen and rely less on the meters.
You can try the compressors, but they don't fit well with the other tools in the suite. Much better to do it at the performance step.