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:

