Defaulting a field in VBS in Hire employee flow

Summary:

The requirement in the Hire Employee flow is to Default the 'Civil Services Joining date' which is under 'Legislative Info' page to a field that comes under 'Work Relationship Info' page in the same flow.

Tried using the Value field to default using VBS , but the defaulting is not working for both the expressions below,

[[ $fields.personLegislativeInfo.legislativeInfoDDF.GB.civilServiceJoiningDate.$initialValue() ]]

or

[[$fields.personLegislativeInfo.legislativeInfoDDF.GB.civilServiceJoiningDate.$value()]]

Any one faced this issue ?

Both the fields are not listed in the Condition to Default or 'To Default' field listed in the link below,

Any inputs appreciated on how to default this . Thank you,