Adding authentication provider results in "Unknown provider."

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After much trial and error, we succeeded!
The following points were the main points of modification

Modify src/extensions/users-permissions/strapi-server.js as follows

"use strict";
module.exports = (plugin) => {
  console.log("strapi-server.js", plugin.services.toString());
  plugin.bootstrap = require("./server/bootstrap");
  plugin.services["providers"] = require("./server/services/providers");
  plugin.services["providers-registry"] = require("./server/services/providers-registry");
  return plugin;
};

src/extensions/users-permissions/server/bootstrap/index.js

const grantConfig = {
    ...getGrantConfig(baseURL),
    line: {
      enabled: true,
      state: true,
      nonce: true,
      oauth: 2,
      icon: "line",
      key: process.env.LINE_OAUTH_KEY,
      secret: process.env.LINE_OAUTH_SECRET,
      callback: `${baseURL}/line/callback`,
      scope: ["openid", "profile", "identify"],
    },
  };

src/extensions/users-permissions/server/services/providers-registry.js

async line({ accessToken }) {
    const line = purest({ provider: "line" });
    const me = await line.get("profile").auth(accessToken).request();
    return {
      username: me.body.displayName,
      email: `${me.body.userId}@strapi.io`,
    };
  },

I think I succeeded in overwriting it by porting providers-registry.js and reloading it again.
I checked Strapi’s Admin Panel and confirmed that the user account has been added.

The rest… Now if only I could figure out how to redirect to the front end after successfully adding an account… perfect!
（under investigation）