Have a question about dynamic values. Want to create a Card, which will be changed based on the answer user choose. here is a code

else if (workflow.demoNiche === 'Martial Arts AI'){
    workflow.demoTitle += 'Chuck AI',
    workflow.demoDes += 'The Martial Art AI chatbot is your reliable assistant, simplifying the training booking process by quickly reserving your preferred martial arts sessions with just a few clicks.',
    workflow.demoImg += 'https://nutopia13.github.io/Botpress-Webchat-Custom/ChuckAI.png',
    workflow.demoLink += 'https://shorturl.at/elBY8'
}

Title, image and subtitle are working, but the action button link not so much. Because of this 'message cannot be displayed'. How can I add dynamic variable in a form of link into action button? There is no option for action button like @variableName Thank you