Is it possible to apply a Ken Burns effect on a small inset video without any of the 4 sides moving?

I have a normal 16:9 video. I've placed a small picture to the right side and I want to apply a zooming in effect (Ken Burns effect) to that image, but I don't want any of the 4 sides to move. I want the size of this image to remain exactly the same. Is that possible? (Screenflow 10.0.5, on M1 Mini)

I use this zoom effect quite often, but always when it's applied to an image that is full screen, so the viewer never sees the expanding sides, since the frame of the entire screen acts as the edges. 

I've tried using a Video Action, but each moving side does a kind of arc, starting out at the right size and ending at the right size, but in-between, each side goes just slightly outside of the correct size before coming back to the correct size.  

Hope this makes sense. It was hard to describe. 

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