Conditional Feedback in pick many

Hi. I have a pick many question where learners are picking multiple items from a list (items they will need to perform a task). I would love to add conditional feedback like "Looks like you have too many tools for the job, try again" and "That doesn't quite look like everything we need, try again" to help give them a nudge in the right direction. I can only figure out how use a correct or incorrect response.  Can anyone point me in the right direction?

Thanks!