How to I set/import REACT_APP_SOME_VARIABLE_NAME for client side when in production on fly.io?

I use import.meta.env.REACT_APP_SOME_VARIABLE_NAME in my code base with setting client secret in fly.io dashboard but was not working. I also tried import.meta.env.REACT_APP_SOME_VARIABLE_NAME and process.env.REACT_APP_SOME_VARIABLE_NAME
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