sts-render-form-field

/**
* Filter the form field output
*
* @since 1.0.0
*
* @param (string)     $element     the form element
* @param (string)     $location     location
* @param (array)     $field         the field array
* @param (boolean)     $echo         whether to output immediatly or not
* @return (string)     $element     the form element
*/

Before the rendered field will be echoed, you can use this filter to alter the HTML.

Related: sts-create-ticket-formfields