No, they are not. The GPX format does not have ability to carry this information as it was defined by Groudspeak years ago.
The Project-GC allows you to add a virtual log that contains at least information about number of favorite points and how many percent of PM logs is that.
The example log:
<groundspeak:text encoded="False"><br />Favorite Points: 8(1%)<br />Yes : Dogs<br />Yes : Recommended for kids<br />Yes : Takes less than an hour<br />Yes : Available at all times<br />Yes : Bicycles<br />Yes : Needs Maintenance<br />Yes : Park and Grab<br />No : Available during winter<br /></groundspeak:text>