Using this plugin, you can add schema code to WordPress categories.

Peyman Naderi

By default, you cannot add schema code to WordPress categories. There are several plugins that you can use to add schema code to categories. 
But using multiple plugins is very harmful. You can easily insert the schema code at the end of articles and products. But, this is not possible for WordPress categories. 
By using the “Add Schema to WordPress Categories” plugin, you will be able to add schema codes to the end of the category description.
Plugin features: 
Sorting the schema code into categories 
Determining whether the schema is correct 
Saving the schema code in the database and using it 
Lightness of the plugin and compatibility with WooCommerce categories

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