Have you actually tried to just put a hyperlink in the Marked up structured data? As stated at the link I show above…
Required properties
TextThe full answer to the question. The answer may contain HTML content such as links and lists. Google Search displays the following HTML tags; all other tags are ignored:
<h1>through<h6>,<br>,<ol>,<ul>,<li>,<a>,<p>,<div>,<b>,<strong>,<i>, and<em>.
This would make me believe that the links, if vetted as being safe by Google, would then show up in the structured data.