I just tried using this online image to webP converter
here & I was quite impressed with the result. It took a 2.8mb .png file @ 1920x1080px & compressed it down to a 260kb (approx) webP file of which I could not tell the difference in quality between the .png or .webP file when I compared them. It worked great in Visionaire Studio too when I tested it by adding it as an interface background & viewed game on my hd monitor.
Unfortunately the online converter only converts one file at a time & I have a ton of animation files to convert.
Any help in the right direction would be appreciated.
Cheers.