Like Meet, Google Hangouts Chat is a service that is included with your GSuite subscription. It is a messaging platform built for teams and has deep integration with the other services included in GSuite. You can think of it as a replacement for not only texting but also an alternative to the send and wait model of email.
I would be happy to meet with you to discuss how to integrate Google Hangouts Chat into your current workflow. Please open a ticket to request an appointment.