"We are the lightworkers"

In Ep10, there are two direct mentions of "lightworkers":

"I wish they would presume competence in non-speakers. For humanity, I desire compassion and understanding for who we are. We are lightworkers."

"We are the lightworkers. We are a team that have knowing we are here to bring change for the negative old way of thinking."

The term has also been used in comments in this sub. Where does the word lightworkers come from? What does it mean to be a lightworker? Is this a common, universally understood label in the psi community?