Try:
<mapframe text="[[This link should be in red]]" width="350" height="350" zoom="13" longitude="-122.39953994750977" latitude="37.81032643553478"> { "type": "Feature", "geometry": { "type": "Point", "coordinates": [-122.3988, 37.8013] }, "properties": { "title": "[[This link should be in red]]", "marker-symbol": "museum", "marker-size": "large", "marker-color": "0050d0" } } </mapframe>
See: