Custom SearchWP Source for BuddyPress Activity

searchwp-customizations.php

<?php

/**
 * Custom SearchWP Source for BuddyPress Activity.
 * NOTE: Requires SearchWP 4
 */
add_action( 'plugins_loaded', function() {
	if ( ! class_exists( '\SearchWP\Source' ) || ! function_exists( 'bp_activity_get' ) ) {
		return;
	}

	class BuddyPressActivity extends \SearchWP\Source {

		protected $name         = 'buddypressactivity';
		protected $db_id_column = 'id';

		function __construct() {
			global $wpdb;

			$this->db_table = $wpdb->base_prefix . 'bp_activity';

			$this->labels = [
				'plural'   => 'BuddyPress Activity',
				'singular' => 'BuddyPress Activity',
			];

			$this->attributes = [ [
				'name'    => 'content',
				'label'   => 'Content',
				'default' => \SearchWP\Utils::get_min_engine_weight(),
				'data'    => function( $entry_id ) {
					$content = '';
					$entry   = bp_activity_get( [ 'in' => [ $entry_id ] ] );

					if ( ! empty( $entry['activities'] ) ) {
						$content = $entry['activities'][0]->content;
					}

					return $content;
				},
			], ];
		}

		// Restrict to Activity updates.
		protected function db_where() {
			return [ [
				'column' => 'component',
				'value'  => 'activity',
			] ];
		}

		// Return results of bp_activity_get() for this Activity entry.
		public function entry( \SearchWP\Entry $entry, $query = false ) {
			return bp_activity_get( [ 'in' => [ $entry->get_id() ] ] );
		}
	}

	add_filter( 'searchwp\sources', function( $sources ) {
		$sources[] = new BuddyPressActivity();

		return $sources;
	} );
} );

Is it possible to use SearchWP\Source to point to a specific media folder or directory using custom engine and has all media attributes?