GramJS

const { Api, TelegramClient } = require("telegram");
const { StringSession } = require("telegram/sessions");

const session = new StringSession(""); // You should put your string session here
const client = new TelegramClient(session, apiId, apiHash, {});

(async function run() {
  await client.connect(); // This assumes you have already authenticated with .start()

  const result = await client.invoke(
    new Api.bots.SetBotBroadcastDefaultAdminRights({
      adminRights: new Api.ChatAdminRights({
        changeInfo: true,
        postMessages: true,
        editMessages: true,
        deleteMessages: true,
        banUsers: true,
        inviteUsers: true,
        pinMessages: true,
        addAdmins: true,
        anonymous: true,
        manageCall: true,
        other: true,
      }),
    })
  );
  console.log(result); // prints the result
})();

import { Api, TelegramClient } from "telegram";
import { StringSession } from "telegram/sessions";

const session = new StringSession(""); // You should put your string session here
const client = new TelegramClient(session, apiId, apiHash, {});

(async function run() {
  await client.connect(); // This assumes you have already authenticated with .start()

  const result: Api.Bool = await client.invoke(
    new Api.bots.SetBotBroadcastDefaultAdminRights({
      adminRights: new Api.ChatAdminRights({
        changeInfo: true,
        postMessages: true,
        editMessages: true,
        deleteMessages: true,
        banUsers: true,
        inviteUsers: true,
        pinMessages: true,
        addAdmins: true,
        anonymous: true,
        manageCall: true,
        other: true,
      }),
    })
  );
  console.log(result); // prints the result
})();