Do I have to initialize viper in every package?

Question

I am using viper for reading config files in my go module.

Tree structure;

.
├── README.md
├── package1
│   └── package1.go
├── config.json
├── helper
│   └── helper.go
└── main.go

I initialized Viper in my main.go

    viper.SetConfigFile("config.json")
    viper.AddConfigPath(".")
    err := viper.ReadInConfig() 
    if err != nil {             
        panic(fmt.Errorf("fatal error config file: %w", err))
    }

Now I can get keys with viper.GetString("key"), everything works fine.

But if In package1.go I do viper.GetString("key") I get empty string(no value).

I had to initialize Viper in package1.go with SetConfigFile and AddConfigPathto make it work.

I dont feel this is the right way, what am I doing wrong?