Cura and YouMagine already support the AMF format. And I am planning to add features like this to the AMF saving.
However, this will violate the AMF standard, as they do not allow custom tags or meta-data.
(In theory you could also put binary data at the end of a binary STL file, but those are all ugly hacks which I would not recommend)
Or we could encourage the adoption of the AMF file format which supports this, instead of stl.
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