Yes, you can do it using an escalation and communication template in the communication template you have to select the role where that role is configured in such a way that it pulls the labor information and then need to create escalation in the condition you can check weather work order having labor or not.
if it has labor, the escalation will run and just attach the communication template to the same escalation so that email also gets sent to labor once the escalation condition sets true.
------------------------------
Vivek Nagre
JLL
------------------------------