{namespace jhcaptcha = Haffner\JhCaptcha\ViewHelpers}

<jhcaptcha:reCaptcha uid="{data.uid}" />
<input type="hidden" id="{f:if(condition: '{data.uid}', then: 'captchaResponse-{data.uid}', else: 'captchaResponse')}" name="###formValuesPrefix###[jh_captcha_recaptcha]" value="" />