WebP is there a way to influence compression amount?

Shopify Partner
9 0 9

I love that shopify is delivering the webp format. My only problem is the image files still seem drastically larger than I'd expect. I mean 5x the size I would make them.

For example, this image uploaded to shopify, shopify serves the webp version at 742kb for the 3000x version. 

The same image on my own server gets compressed to 140kb for the 3000x version and the quality is still great for my needs. 

I know there's this post that discusses shopify's compression rates for jpg,png, but no info on webp. In an experiment, uploading a heavily compressed .jpg doesn't seem to make any difference.

Is the only option to host images outside of shopify if we want smaller webp files?