That information is not available in any other PPM OLTP or DWH DB table. Check on the PPM Schema to see if the field is filled in in FIN_COST_PLAN_DETAILS.
Fields in fin_cost_plan_details such as resoure_id, role_id, charge_code_id, will only be populated if the cost plan is grouped by the attributes.
Therefore, the only way you can get the cost by ResourceID information is by grouping a cost plan by Resource- then the Resource ID data will be updated in the FIN_COST_PLAN_DETAILS table.