You are the first to request it. So far we have only built support for Proxl XML (http://proxl-ms.org/) for crosslink search results. Proxl has a set of converters from raw search results to Proxl XML. You can find a list of the existing converters at the bottom of this page with links to their GitHub projects:
I do not see one for Mascot.
However, we would like to begin adapting our existing native search results readers to support results with crosslinked peptides. If you can provide us with an example for Mascot, we can look into adapting the Skyline (BiblioSpec) Mascot library builder to support it. We can also point the developer responsible for Proxl converters to your example data, and he likely will be interested in creating a converter for it.
Thanks for posting to the Skyline support board. We look forward to working with you to extend our support for crosslinking experiments.