Need to save additional data with new DzProperty

I need to store certain string data along with a newly created (standard) DzFloatProperty,

I looked into getAttributes / setAttributes, but although I can read the default attributes, if I add more values to it and then try to set the attributes back to the property, this new settting entries are not stored. Is this not the intented use? if not, is there an out of the box way to store extra info when creating properties?

Thank you.