You can add the advanced persona characteristics all within the persona's step or under the persona's tab in the Studio panel.
Once you reach the Persona step in creating your reaction, you'll notice a gearbox icon that refers to the settings of the persona:
Once you click the icon, a pop up window will appear that allows you to edit and add the information:
Note: Regular Expressions are supported for both the Key and Value inputs.
A valid Key and Value must be defined for each characteristics. To match any/all Values, simply use a regular expression ".*" or ".+".
Once completed, click the 'Save & Close' button and click on the option to use the persona:
Alternatively, you can create a persona first before you create a reaction in the persona's tab of the panel:
Click on the '+' icon to create a new persona:
The same screen will appear for you to create your persona.
For more, please read this article on how to create a persona.