Breadcrumb issue with missing structured data

Hello!

I’ve installed the Yoast plugin and enabled breadcrumbs. Everything is showing and works fine except the thing that breadcrumbs doesn’t have any structured data. If I test my URL in google structured data tool it doesn’t show that there are breadcrumbs. Currently, they are in plain HTML without the markup. I’m using Voice theme which fully supports Yoast plugin and I’ve also added the URL of the website. Could someone please advise on what should I do in order to correct this issue?

The page I need help with: [log in to see the link]