We’re looking for a way to store, and use more complex data types within Contact properties, than simple strings.
One example of this is JSON. One suggestion that we found was to create new property groups, and properties under that, but that assumes that all the groups are pre-defined, and singletons.
This is not the case for us, unfortunately.
A prime example of what we’re looking for, is what Customer.io offers. We can send simple JSON as a parameter, and then access the attributes in other contexts.