So we agree it is probably a good idea to put this in structured data somewhere, but we are not sure of the best place to put it.
To my mind, it would work very well in BCD, in the status sections, for example:
But I can understand Florian being wary about keeping it strict and focused, and not wanting everything to just be dumped in there. I guess the distinction here is that the BCD is stuff is all about specific standards features, whereas secure context status is a more general thing. We don’t need to mark every BCD data point - marking each API would be enough, as you’re not going to get part of an API in a secure context, and part not. (Well, I hope not anyhow!)
So it makes me wonder what would be the best way to record it. Is there an existing data structure we could add this to, or would we have to create a new data file somewhere inside https://github.com/mdn/data/tree/master/api?