how to store property value in jcr content level with out select radio button in touch ui Dialog in AEM 6.3

Question

For checkbox we have uncheckedValue "false" property

Once drag and drop component open dialog with out checked checkedbox and closing dialog i am able to store property value in jcr node

How to do for radio button to store property.

Default value for radio button in AEM 6.2 touch UI enter link description here