I am wondering if this article helps:
https://helpcenter.graphisoft.com/tips/bimx/share-the-best-of-your-model-on-social-media-sites-direc...
It does not talk specifically about adding BIMx models to your web site, but after adding it to Facebook, for example, I would probably look at the HTML source code and see if there is any HTML code I could use (copy-paste, modify) so post it on my web site (just a guess that this might work).
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