Here it is:
# BEGIN Converter for Media
# ! --- DO NOT EDIT PREVIOUS LINE --- !
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteOptions Inherit
RewriteCond %{QUERY_STRING} original$
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule . - [L]
RewriteCond %{HTTP_ACCEPT} image/avif
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{DOCUMENT_ROOT}/wp-content/uploads-webpc/$1.jpg.avif -f
RewriteRule (.+)\.jpg$ /wp-content/uploads-webpc/$1.jpg.avif [NC,T=image/avif,L]
RewriteCond %{HTTP_ACCEPT} image/avif
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{DOCUMENT_ROOT}/wp-content/uploads-webpc/$1.png.avif -f
RewriteRule (.+)\.png$ /wp-content/uploads-webpc/$1.png.avif [NC,T=image/avif,L]
RewriteCond %{HTTP_ACCEPT} image/avif
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{DOCUMENT_ROOT}/wp-content/uploads-webpc/$1.webp.avif -f
RewriteRule (.+)\.webp$ /wp-content/uploads-webpc/$1.webp.avif [NC,T=image/avif,L]
RewriteCond %{HTTP_ACCEPT} image/avif
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{DOCUMENT_ROOT}/wp-content/uploads-webpc/$1.jpeg.avif -f
RewriteRule (.+)\.jpeg$ /wp-content/uploads-webpc/$1.jpeg.avif [NC,T=image/avif,L]
RewriteCond %{HTTP_ACCEPT} image/webp
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{DOCUMENT_ROOT}/wp-content/uploads-webpc/$1.jpg.webp -f
RewriteRule (.+)\.jpg$ /wp-content/uploads-webpc/$1.jpg.webp [NC,T=image/webp,L]
RewriteCond %{HTTP_ACCEPT} image/webp
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{DOCUMENT_ROOT}/wp-content/uploads-webpc/$1.png.webp -f
RewriteRule (.+)\.png$ /wp-content/uploads-webpc/$1.png.webp [NC,T=image/webp,L]
RewriteCond %{HTTP_ACCEPT} image/webp
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{DOCUMENT_ROOT}/wp-content/uploads-webpc/$1.jpeg.webp -f
RewriteRule (.+)\.jpeg$ /wp-content/uploads-webpc/$1.jpeg.webp [NC,T=image/webp,L]
</IfModule>
<IfModule mod_headers.c>
<FilesMatch "(?i)\.(jpg|png|webp|jpeg)(\.(webp|avif))?$">
Header append Vary "Accept"
</FilesMatch>
</IfModule>
# ! --- DO NOT EDIT NEXT LINE --- !
# END Converter for Media