What is the best way to invoke a firebase https callable function from within another https callable function

Question

I wanted to know the best practice for invoking a callable (or "onCall") Firebase function from another Firebase callable function, where each of the callable functions are endpoints

I've seen workarounds that use a common Node function that both Firebase functions would invoke, but I want to avoid this.

I am specifically invoking another callable function within the first callable function so that I can monitor each function separately.

I am using the onCall http functions rather than the onRequest http functions to avoid testing and writing middleware.

The method I am using right now is as follows:

// first function invoked
export const firstFunction = https.onCall( async (data) => {
    msg = data.message;
    const firebaseConfig = {
       apiKey: "...",
       authDomain: "...",
       projectId: "...",
       storageBucket: "...",
       messagingSenderId: "...",
       appId: "...",
       measurementId: "...",
    };
   
    const app = initializeApp(firebaseConfig);
    const functions = getFunctions(app, "us-central1");
    connectFunctionsEmulator(functions, "localhost", 5001);
    
    const callingFunction = httpsCallable(functions, "sendEmail");
    const result = await callingFunction(msg);
    console.log( result );
}

// function called by the first function
export const sendEmail = https.onCall( async (data) => {
    sgMail.send( data );
    return { sucess: true };
}

Is there a way I can invoke the callable function without having to initialize the app and use the getFunctions() method?

Thanks