Can query single post type, not multiple

I am using Toolset to manage my custom content, I need their Views functionality, and am using the following code snippet to call the custom fields associated with that content into posts into GraphQL:

<?php
add_action( 'graphql_register_types', function() {
    register_graphql_field( 'SupportCall', 'summary', [
       'type' => 'String',
       'description' => __( 'Call summary', 'wp-graphql' ),
       'resolve' => function( $post ) {
         $summary = get_post_meta( $post->ID, 'wpcf-summary', true );
         return ! empty( $summary ) ? $summary : $summary;
       }
    ] );
  } );

I am able to query single posts, but not multiple posts, which I need to make a posts list. Is there a setting I need to change, or something I need to add to the code to retrieve multiple posts? Or do I need a totally different code snippet?