Yes, Gumlet will automatically convert images into next-gen formats based on the client browser capabilities, if you want to convert your images to webp format specifically then you can use
fomrat=webp query parameter in the image URL.
Webp: WebP image file format to take the role of the JPEG, PNG, and GIF file formats. It enables animation, alpha transparency, and both lossy and lossless compression.
Avif: avif is a more recent format than webp and we provide serve avif images if the browser can allow it.