THis is the answer provided by Soflyy:
This is something that typically your theme takes care of. You would need to select a theme or a plugin that does this and then figure out how the theme / plugin is storing its data. To do that you can read the docs for the plugin, ask the developers, or just manually make a new record with the plugin and then take a peek under the hood to see what the plugin is doing. Once you know how you need to import the data, you can ask us about the best way to do that.
If it just uses standard custom fields then it should be pretty similar to importing into Yoast WordPress SEO, which you can read about here: https://www.wpallimport.com/documentation/plugins-themes/yoast-wordpress-seo/
