You add any KSES hooks here.

There is currently only one KSES WordPress hook, {@see ‘pre_kses’}, and it is called here.
All parameters are passed to the hooks and expected to receive a string.

function wp_kses_hook( $string, $allowed_html, $allowed_protocols ) {
	/**
	 * Filters content to be run through KSES.
	 *
	 * @since 2.3.0
	 *
	 * @param string         $string            Content to filter through KSES.
	 * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
	 *                                          or a context name such as 'post'. See wp_kses_allowed_html()
	 *                                          for the list of accepted context names.
	 * @param string[]       $allowed_protocols Array of allowed URL protocols.
	 */
	return apply_filters( 'pre_kses', $string, $allowed_html, $allowed_protocols );
}