"have expertise" is a correct and usable phrase in written English. You can use it when referring to someone having a specific skill set or knowledge. For example, "She has expertise in accounting and finance.".
"They have expertise in macroeconomics and the more theoretical side.
Capita recognises that charities have expertise in this area.
We have expertise in running social enterprise," he says.
The only techy thing I have expertise in is PowerPoint.
Between them, the CSAs have expertise in physical, life and social sciences, and engineering.
"Because of the breadth of our coalition, we have expertise on every issue".
School board members do not usually have expertise in these areas before they begin their service.
I love the desktop app, it’s always running on my Mac. Ludwig is the best English buddy, it answers my 100 queries per day and stays cool.
Cristina Valenza
Retail Lead Linguist @ Apple Inc.