Set sub sizes to be generated in JPG image format in WordPress 5.8 on child sites.
Snippet Type
Execute on Child Sites
Snippet
function mysite_wp_image_editor_output_format( $formats ) {
$formats['image/jpg'] = 'image/webp';
return $formats;
}
add_filter( 'wp_image_editor_output_format', 'mysite_wp_image_editor_output_format' );