How to train dog to appropriately ask to play

Our dog is 11 months. Super smart redbone coonhound mix. Him and my husband play together pretty actively. Lately he's been play biting/nipping to try to get my husband to play/chase him. How can we get him to ask to play appropriately? We have a tug toy that we are labeling with "play" to see if he will bring it to us to play.