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I wouldn't use track motion for that, for a couple of reasons.
It's only one clip; you don't need to affect an entire track for it; you only need to do it to the clip you want to zoom in on. If you do it to the track, then you have to go back to normal zoom immediately when you get to the next clip, and that's another keyframe. And if you want to move the clip, then you have to move the track motion keyframes with it, which can get messy. Doing it in pan/crop keeps it contained to the clip, no muss, no fuss, only two keyframes which don't change if you move the clip.
Also, pan/crop's image scalers are better, so you'll have a higher-quality image once you zoom in.
...Also, pan/crop's image scalers are better, so you'll have a higher-quality image once you zoom in.
In the event OP finds Track Motion easier, the clip could go on its own track.
If track space is an issue, it could be put it in a track group with others.
I was just offering another option as OP seemed to be having difficulty with the suggested method.
Interesting to know - I'd assumed both methods used the same underlying scaler logic.
Track Motion is certainly worth knowing about - even though it and Pan/Crop overlap in their possible results, one or the other is usually easier for any particular effect.