Webp support?

Hi there
I was wondering if it's possible to use the webp image format for product images?
I added webp and image/webp as both file extension and MIME types in Configuration > Option [File]
When saving a product with a webp image I get the error - 
0 imagecopyresampled(): Argument #2 ($src_image) must be of type GdImage, null given

Dear Martin,

Currently, we don't support webp image type. We added this feature into the todo list. We will implement it soon.

Sincerely, Giang

"We will implement it soon."
when ?