Contact Sublist-Is this scriptable?

Hi There

I am trying to retrieve details of the 'contact' sublist from the customer record.

I have tried to use the  following for this:

(recordsobj is referencing the customer record--this part is working correctly)

var email = recordObj.getSublistField({

        sublistId: "contact",

        fieldId: "email",

        line: i,

      });

var email = recordObj.getSublistField({

    sublistId: "contactRoles",

    fieldId: "email",

    line: i,

   });

Neither of these produce any results.

Is this a scriptable record?

I have looked at the records browser and cannot tell from that.

Thanks