In Asia,messaging platforms are growing rapidly, with users in the hundreds of millions, both at work and play. The popularity of these platforms is spreading globally.It’s been reported that 76 percent of employees in some western countries are using emojis at work.

老师好！

请问句子中in the hundreds of millions是users的后置定语吗？In the hundreds of millions在这里的用法和含义怎样理解，谢谢老师。