In my experience WebP didn't work well for the general case where this technique is actually useful (i.e. data less than 10 KB), because the most additions of W

In my experience WebP didn't work well for the general case where this technique is actually useful (i.e. data less than 10 KB), because the most additions of WebP lossless to PNG are about modelling and not encoding, while this textual compression would only use the encoding part of WebP.