SBE is a zero-copy schema-full serialization format. I don't think there's anything which limits the format to the financial domain. For example, here's [1] a toy example of a schema describing a car.
[1] https://github.com/real-logic/simple-binary-encoding/blob/ma...
I will consider it in future though, while I'm familiar with SBE it's not one I'd have thought of when thinking about serialisation.