How do I add a click to call URI in HB-Themes contact widget?

Hi!

I’m using the HB-Themes contact widget in my footer and want to have a click to call feature in the Phone field, so that mobile visitors can just click on the number and start the phone call. In regular HTML I just add the URI (i.e. +1 (44) 123-45-678), and that’s it, but I can’t eem to add the URI in the widget’s Phone field. How can I achieve this?

Regards,

Sergio.