How to upload packages via yarn to the client side of the application?

Question

Node.js

Hello, I have a project client / server
app
--/client
--/client/package.json (2)
- ...
- package.json (1)

in (1) there is a script that starts both the client and the server at the same time (

"server": "nodemon app.js",
"client": "cd client && yarn serve",
"dev": "concurrently \"yarn server\" \"yarn client\""

)
and how to put packages into the client through (1).json with yarn 'om?