How To Build React App Through Gradle Task

Question

I am a new in gradle task creation.I am using Spring application as backend and in frontend I am using React App.So now My question is how can I build react app using npm run build through gradle task and copy the build folder to the wepapp folder which is present inside the spring application(<project_path>src\main\webapp).My Backend folder and Frontend folder present in same folder.Just like below,

<project_path>/Backend

<project_path>/Frontend

Or is there any other solution do achieve the above? beacuse everytime I need to run the build cmd and copy the build folder to the webapp folder.