How to add goal weights while mass assigning goals?

Summary

How to add goal weights while mass assigning goals?

Content

Hello, 

Need some expert advise, we are planning to run a Mass Assign Goals to assign goals to 500 employees. They all have a goal plan that includes Goal weight, however, when we Mass Assign Goals we do not see an option to add weights result in 0% when goals are added to the Goal plan. 

All the mass assign goals are locked for editing, hence we will have to add weights before we run the mass assign. Is there a way to do it?