bbp_map_caps_to_wp_roles()

function bbp_map_caps_to_wp_roles() {
	$wp_bbp_role_map = [
		'administrator' => 'bbp_keymaster',
		'editor'        => 'bbp_moderator',
	];

	foreach ( $wp_bbp_role_map as $wp_role => $bbp_role ) {
		$wp_role_object = get_role( $wp_role );

		if ( empty( $wp_role_object ) ) // check if role exists if not then continue
			continue;

		$bbp_caps = bbp_get_caps_for_role( $bbp_role );

		foreach ( array_keys( $bbp_caps ) as $cap) {
			$wp_role_object->add_cap($cap);
		}
	}
}