I totally agree with this suggestion. For me, it would move Affinity up yet another league.
At the moment, I import vector graphics into Blend for Visual Studio by using Illustrator.ai files. That works perfectly OK up to Blend for VS2013, but Microsoft dropped the .ai import option for VS2015 and 2017, so I have to have 2 versions of Blend on my PC to do that.
What I'd like to do is to use Affinity for the vector work, export to XAML, to use directly in Visual Studio. At the moment it's only possible to export to .svg from Affinity, then use a 3rd party converter. That's messy, and all the SVG to XAML converters that I've tried give a much less perfect conversion than the method I currently use. So that leaves me with having to continue to use Illustrator.
So - please, Serif, think about giving this some priority? I think there are a lot of us who would love this extension to an already fabulous application. Maybe MS would sell the code, since they no longer seem to want it?......