Solution 1: Add code
Inside your themes directory funcitons.php
, add code below
add_action ( 'category_edit_form_fields', function( $tag ){
$cat_prod_left = get_term_meta( $tag->term_id, '_cat_prod_left', true ); ?>
term_id, '_cat_prod_right', true ); ?>
Screenshot
Solution 2: Advanced Custom Field
Image credit: Photo by Launchpresso on Unsplash