Louis

This WordPress plugin extends the default search to include meta (custom) fields
Major features in WP Search Include Meta Fields include:
<ul>
<li>No configuration necessary</li>
<li>Integrates with core search functionality</li>
<li>Doesn’t alter the database</li>
</ul>

WP Search Include Meta Fields

License: GPLv2 or later WordPress plugin to extend default search to include meta fields

i-Gen.ai

IGen SEO API plugin allows you to access Yoast SEO meta fields through WordPress REST API. This plugin registers the following Yoast SEO fields to the REST API:
<ul>
<li>SEO Title (_yoast_wpseo_title)</li>
<li>Meta Description (_yoast_wpseo_metadesc) </li>
<li>Focus Keyword (_yoast_wpseo_focuskw)</li>
</ul>
Key Features: 
* Automatically checks if Yoast SEO plugin is installed 
* Shows installation prompt if Yoast SEO is not installed 
* Only registers meta fields when Yoast SEO is active 
* Provides secure admin notification system
About IGen
This plugin is developed by <a href="https://i-gen.ai/" rel="nofollow ugc">IGen</a>, a leading AI-powered content generation platform. Visit our website to learn more about our innovative AI solutions for content creation and SEO optimization.

IGen SEO API

Register Yoast SEO meta fields to make them accessible through REST API for reading and writing.

WP Search Include Meta Fields vs IGen SEO API