How to autocorrect image extensions using htaccess?

Question

htaccess

Friends, help me understand why autocorrection of extensions via htaccess does not work. Essentially, there should be a replacement for jpg/png with webp if the user's browser supports webp. The post itself always contains a .jpg picture
. The replacement works if you only delete the picture with the .jpg extension in the site folder or change it to .jpeg (using the poke method).
And I know that the console will still show that the picture has the .jpg extension and the fact that that there is a substitution for webp is visible only in the type column of the web developer console.
Here is the actual code:

<IfModule mod_rewrite.c>
  RewriteEngine On

  # Check if browser supports WebP images
  RewriteCond %{HTTP_ACCEPT} image/webp

  # Check if WebP replacement image exists
  RewriteCond %{DOCUMENT_ROOT}/$1.webp -f

  # Serve WebP image instead
  RewriteRule (.+)\.(jpe?g|png)$ $1.webp [T=image/webp,E=accept:1]
</IfModule>

<IfModule mod_headers.c>
  Header append Vary Accept env=REDIRECT_accept
</IfModule>

<IfModule mod_mime.c>
  AddType image/webp .webp
</IfModule>

Answer 1

Using the webp format for images. How to implement this with .htaccess?