wp_add_inline_script

/**
 * Adds extra code to a registered script.
 *
 * Code will only be added if the script is already in the queue.
 * Accepts a string $data containing the Code. If two or more code blocks
 * are added to the same script $handle, they will be printed in the order
 * they were added, i.e. the latter added code can redeclare the previous.
 *
 * @since 4.5.0
 *
 * @see WP_Scripts::add_inline_script()
 *
 * @param string $handle   Name of the script to add the inline script to.
 * @param string $data     String containing the javascript to be added.
 * @param string $position Optional. Whether to add the inline script before the handle
 *                         or after. Default 'after'.
 * @return bool True on success, false on failure.
 */