[Resolved] Import GP export file though One Click Demo Import

Kind of a developer question.

I am using the One Click Demo Import plugin to try and import theme settings for exporting to another site. I am also exporting an array containing the GP export JSON file exported from Customizer -> GeneratePress. I am exposing the array with the following code:

function ocdi_import_files() {
  return [
    [
      'import_file_name'           => 'Demo Import 1',
      'import_file_url'            => get_stylesheet_directory_uri() . '/demo-data/demo-content.xml',
      'import_widget_file_url'     => get_stylesheet_directory_uri() . '/demo-data/widget-content.wie',
      'import_customizer_file_url' => get_stylesheet_directory_uri() . '/demo-data/customizer-content.dat',
      'import_preview_image_url'   => get_stylesheet_directory_uri() . '/screenshot.png',
      'preview_url'                => 'http://test.test/',
      'import_json'               => array(
				array(
					'file_url'    => trailingslashit( get_stylesheet_directory_uri() ) . '/demo-data/gp-export.json',
					'option_name' => 'GP_option_name',
				),
			),
    ],
  ];
}
add_filter( 'ocdi/import_files', 'ocdi_import_files' );

The import_json array contains the JSON file that I then need to process. The above plugin has an ocdi/after_import hook that runs after the import settings. In there, I need to be able to run some code to import the JSON file into the GeneratePress settings of the destination file where the plugin is also installed.

Can you provide the function that GP uses to import the JSON file so I can update the hook?