What about to add the capability to set properties with given set of values?

Hello, i would like to use this package in a project where i serialize/deserialize entities in/from json file. I know that when applied to the full ORM it is up to the hydratator to populate the instantiated object with the right values respecting the mapping etc, but when used alone i feel that the package is missing the capability to populate the instantiated object with given values. What do you think about?