This feature is at the top of the new features list.
We will let you know in which version this will be introduced but we are trying to have it ready for the next update.
There is a work-arround that works on browsers that accept svg.
You create a web page with only the svg image. (create the .html document) and use the HTML Website widget to include the web page in prototyper.
The image won't show in Prototyper but it will show in the browsers that support svg.
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