How to get session properties from sessionStorage (Experience Vitals vesion)

[Tommaso_Fin]

Hi, 

I'm migrating my RUM monitoring from Frontend classic to Experience Vitals. 

In the classic Frontend app I configured to get session properties from sessionStorage in this way: 

• Source type: JavaScript variable
• Captured expression: sessionStorage.myVariable

How can I do the same with Experience Vitals?

Thanks