Quicktime embedded keykode

In Resolve 15, in the metadata window, there's a field for keykode. I haven't yet seen a Quicktime file that has this filled in. Does anyone know what the metadata field is called, and would you happen to have a sample quicktime file with keykode embedded?

We're looking for a solution with our scanner to try to get keykode metadata embedded in Quicktime files. Right now, it only works for DPX.

Thanks!

-perry