Change pixels per unit for an imported asseet, but only on x axis

Instead of changing the transform scale values of my imported asset, I thought it would be a better idea to change the pixels per unit and keep the scale to 1 on all axis. The problem is that my preferred scale of the asset is 0.45 on the x-axis and 0.34 on the y-axis. Is there any way to resize the image on the x-axis in unity without changing the scale property in the transform?

I have tried to just stretch the picture in pixlr.com (simple image editor) and while that worked fine, it made the image more blurry so is there any way for me to accomplish the same thing without quality loss?

 

theres not a way to do that

use a good program like photoshop to stretch your image, or use the scale, why do you want to keep scale 1?