How do i connect my authenticated service account Google People API to read contacts on my personal user account?

I have my service account JSON credentials in my environment. I am able to use the Google People API while connected to a service account. But I can't make requests to impersonate my personal user account which owns the platform.

I throws error when i add my user Gmail as subject account.

    require("dotenv").config();
    const { google } = require("googleapis");

    let scopes = ["https://www.googleapis.com/auth/contacts"];

    const init = async () => {
    console.log("Auth Started");
    let auth = await google.auth.getClient({
      scopes,
     });
    // auth.subject = "username@gmail.com";
    const { people } = google.people({
      version: "v1",
      auth,
    });
    let res = await people.connections.list({
      resourceName: "people/me",
      personFields: "names",
    });
    console.log(res);
    };

    init();

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