how to migrate autocomplete rule having logic to Get number value from value set

Summary:

Our customer has a autocomplete rule of Rule Type 'Field Modification Rule Type'
for business object 'Job Requisition' setup in fusion application

Please advise how to incorporate this into the redwood page(i.e VBS) using business rule. The existing rule derives a value from value set using the function —

Get number value from value set

We are unsure of how to implement this logic in the business rules of VBS. Please provide us the solution

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