How to do this in .htaccess?

Question

htaccess

there is a condition

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule . index.php [L]

it is necessary to make it so that if there is no file, then it searches for it in ./../somedir, and then only sends a request to index.php
how to do this?

Answer 1

redirect ./../somedir to / before your rule