Need to add "worker category" field as input parameter to "Element Result Register" report

Summary

Need to add "worker category" field as input parameter to "Element Result Register" report

Content

Hi,

I need to add "worker category" field , which can be seen at employee assignment level  ( not assignment  category field ) as one of the input parameter along along with prompt  to "Element Result Register" report ( Extract) .

Could you please list down each steps to achieve this .