Rick Hellewell

You can block ChatGPT and Bard and other compatible AI scanners from using your site content by adding specific commands to your site’s virtual robots.txt file. Note that an actual robots.txt file in your site root will override the virtual commands.
The plugin also adds your sitemap.xml file to the virtual robots.txt file.

ChatBot Blocker by CellarWeb

ChatBot Blocker by CellarWeb    adds commands to the WordPress virtual robots.txt file to block various chatbots from using your site content.

Marat Nepomnyashy

Overview:
At the time of this writing, the latest version of WordPress, version 4.7, 
 has functionality to discourage search engines from indexing the whole site, 
 but not functionality to discourage search engines from indexing only certain 
 specific pages and posts of the site.
Robots Meta Whiz is a WordPress plugin that allows site administrators to 
 deploy custom meta robots tags to discourage search engines from indexing, 
 following links from, caching, indexing images from, and / or have 
 additional custom restrictions on only for certain specifically-designated 
 pages and posts.
It is an easy way to discourage search engines from indexing only specific 
 pages / posts.
This only applies to search engine robots, and will not effect the site’s 
 local search functionality.
Technical summary:
Plugin works by hooking-in special logic into the action ‘wp_head’ to inject 
 the tag <code><meta name='robots' content='...'></code> with restriction directives for 
 the specified pages and posts.
Official project URLs:
https://wordpress.org/plugins/robotswhiz 
 https://github.com/maratbn/RobotsWhiz

Robots Meta Whiz

Easy way to discourage search engines from indexing only specific pages / posts with custom meta tags.

ChatBot Blocker by CellarWeb vs Robots Meta Whiz