The first thing you need is to create the fields that will store the RR-OE and WSJF values. Create a custom decimal field through the process hub and add it to the work items you want to display WSJF data on.
Navigate to the "WSJF" hub on the collection settings admin experience. From here, you must specify the fields that will be used for Business Value, Time Criticality, Job Size and WSJF. The first three are defaulted to the fields provided out of the box by Microsoft but can be changed to custom fields if you prefer.
Auto calculated WSJF field on the form
WSJF is automatically updated when form is loaded.
WSJF is automatically updated when the Business Value, Risk Reduction | Opportunity Enablement Value, Time Criticality, or Effort fields are updated.
Recalculate WSJF context menu item
Update WSJF for all selected work items on the backlog or query grid.
Specify which fields are used for WSJF, Business Value, Time Criticality, and Effort .
Because this extension requires the new work item form, it is only supported on Azure DevOps and the TFS 2018 and above.