Custom fields mapping in ALM Octane

Hello all,

I am trying to sync incidents in ServiceNow with Defects in ALM Octane, and I have some custom fields that needs to be mapped. But I am not seeing in the list of fields for the type Defect in mapping step. 

I tried to reload the data sources, re-logged in but no luck. Anyone aware if MF Connect supports custom fields added in Octane or ServiceNow. 

I am not seeing any mentions about custom or user defined field in this page too.