PHP extensions (like `mongodb`) is not loading for a specific PHP version (e.g., 8.1) enabled by Laravel Herd on macOS?

I’m using Laravel Herd on macOS with multiple PHP versions managed by Herd (7.4, 8.1, 8.2, 8.3). I verified that PHP 8.1 is active using php -v.

Following the Herd documentation for adding extensions (https://herd.laravel.com/docs/1/advanced-usage/additional-extensions), I installed the mongodb extension using brew install php and sudo pecl install mongodb.

I found mongodb.so in two locations:

  • /opt/homebrew/lib/php/pecl/20230831/mongodb.so
  • /opt/homebrew/Cellar/php/8.3.4/pecl/20230831/mongodb.so

However, upon installation, the extension line extension=/opt/homebrew/lib/php/pecl/20230831/mongodb.so was automatically added to the Herd php.ini for the 8.3 version. And mongodb extension is showing fine on php 8.3 nad listed after running php -m, even though the active version is php 8.1.

As I need the extension on php 8.1, When I manually added the same line to the Herd php.ini for the 8.1 version, I encountered the error:

Warning: PHP Startup: Unable to load dynamic library 
'/opt/homebrew/lib/php/pecl/20230831/mongodb.so'

Can anyone give some idea on the recommended approach to install php extension for individual php version enabled by laravel herd?