If the information is not much, you could use encrypted cookie data, and read back the data on page load.

1. Create a .env file in your project root folder
2. Save your pass access in this file like so REACT_APP_PASS=8604460484466
3. use a function like

    const encryptWithAES = (text, pass) => {
      const passphrase = pass;
      return CryptoJS.AES.encrypt(text, passphrase).toString();
    }; // remember to import CryptoJS

4. When the page loads you can read the data with:

    export const decryptWithAES = (ciphertext, pass) => {
      const passphrase = pass;
      const bytes = CryptoJS.AES.decrypt(ciphertext, passphrase);
      const originalText = bytes.toString(CryptoJS.enc.Utf8);
      return originalText;
    };

5. When you want to store the cookie, then you can do it like so:

const tobeStored = encryptWithAES('text to encrypt', process.env.REACT_APP_PASS);
// then store it in your cookie.

6. When you want to retrieve it:

const cookieData = someGetCookieFunction('UserInfo');
const decrypted  = decryptWithAES(cookieData,process.env.REACT_APP_PASS); 

7. I am assuming that you know how to read cookie from your script.

See more information here and Here As well on how to set and call environment variables.