Can Project Web App track output produced rather than time spent?

Hi -- I understand how team members can track the amount of time that they've spent on different tasks using Project Web App.  However, what I really need to keep track of is how much they've produced, rather than how much time that they've spent on it. 

For example, I would like each team member to be able to give me a weekly report that says:

# of sparkly blue widgets completed:  10

# of pink matte widgets completed: 15

# of beige widget accessories: 50

I don't care how long it took them to make any of the widgets or widget-related items.  I just want to know how many each team member made in a week. Right now we do this in Excel, but I would love to figure out a way to make some sort of form in PWA where they could just enter their numbers. 

Is that possible? 

Thanks