How can I link parameters to custom attributes?

Hello all!
In CATIA v5 I can create/define Added Properties: 

and then I am able to link to a new parameter:


But if I try to do it with CATIA 3DX On Cloud or On Premises, in Formula Editor, I am not able to find the custom properties created from Platform Management > Attributes Management.

I know that I can link custom properties from 3DX to CATIA v5, but with Power'By for CATIA v5, but I need to do it with CATIA 3DX. Could somebody tell me if I can do it and how? Thank you.