NodeJS + Sequelize / How to perform triple model query?

Question

I come from this topic: NodeJS & Sequelize: How can I join 3 models?

I come to you now, because I need someone who can teach me about how to get started on junction models with NodeJS and Sequelize.

What I'm trying to do is, having 2 main models, for example, Employee and Office, a 3rd model called EmployeeOffice enters and connects the 2 main models, including its own field called "employee_chair". When i call a method, for example, Office.findAll, this is what I would get:

{
    "id": 1,
    "office_name": "Mars"
    "office_color": "Red",
    "createdAt": "2021-09-30T18:53:38.000Z",
    "updatedAt": "2021-09-30T18:53:38.000Z",
    "employees": [
        {
            "id": 1,
            "employee_name": "Albert",
            "employee_mail": "qalbert443@gmail.com",
            "createdAt": "2021-09-30T18:53:45.000Z",
            "updatedAt": "2021-09-30T18:53:45.000Z",
            "employee_office": {
                 "createdAt": "2021-09-30T18:53:45.000Z",
                 "updatedAt": "2021-09-30T18:53:45.000Z"
            }
        }
    ]
}

NOW. What I need, is to have the model called instead of the junction table that is automatically created. Because I can join the 3 tables, but the 3rd table has the field "employee_chair", that I mentioned earlier. The desired response would look like this:

{
    "id": 1,
    "office_name": "Mars"
    "office_color": "Red",
    "createdAt": "2021-09-30T18:53:38.000Z",
    "updatedAt": "2021-09-30T18:53:38.000Z",
    "employees": [
        {
            "id": 1,
            "employee_name": "Albert",
            "employee_mail": "qalbert443@gmail.com",
            "createdAt": "2021-09-30T18:53:45.000Z",
            "updatedAt": "2021-09-30T18:53:45.000Z",
            "employee_office": {
                 "employee_chair": 3,
                 "createdAt": "2021-09-30T18:53:45.000Z",
                 "updatedAt": "2021-09-30T18:53:45.000Z"
            }
        }
    ]
}

How can I do to make (or force) sequelize to make the relations through the model and not through the automatically created table?

Hope you guys can help me, I'm stuck and I don't know where to ask

@cupid22 Here is my index.js, userproject model and the controller function im calling:

index.js:

const dbConfig = require("../config/db.config.js");

const Sequelize = require("sequelize");
const sequelize = new Sequelize(dbConfig.DB, dbConfig.USER, dbConfig.PASSWORD, {
  host: dbConfig.HOST,
  dialect: dbConfig.dialect,
  operatorsAliases: false,

  pool: {
    max: dbConfig.pool.max,
    min: dbConfig.pool.min,
    acquire: dbConfig.pool.acquire,
    idle: dbConfig.pool.idle
  }
});

const db = {};

db.Sequelize = Sequelize;
db.sequelize = sequelize;

db.projects = require("./project.model.js")(sequelize, Sequelize);
db.users = require("./user.model.js")(sequelize, Sequelize);

db.projects.belongsToMany(db.users, {
  through: "users_projects",
  as: "users",
  foreignKey: "user_id",
});

db.users.belongsToMany(db.projects, {
  through: "users_projects",
  as: "projects",
  foreignKey: "project_id",
});

module.exports = db;

Controller function:

    // Retrieve all Projects from the database.
exports.findAll = (req, res) => {
  const title = req.query.title;
  var condition = title ? { title: { [Op.like]: `%${title}%` } } : null;

  Project.findAll({ 
    include: [
    {
      model: User,
      as: "users",
    }]
  })
    .then(data => {
      res.send(data);
    })
    .catch(err => {
      res.status(500).send({
        message:
          err.message || "Some error occurred while retrieving projects."
      });
    });
};

UserProject Model:

    module.exports = (sequelize, Sequelize) => {
  const UserProject = sequelize.define('user_project', {
    user_id: {
      type: Sequelize.INTEGER,
      references: {
        model: 'user',
        key: 'id'
      }
    },
    project_id: {
      type: Sequelize.INTEGER,
      references: {
        model: 'project',
        key: 'id'
      }
    },
    user_type: {
      type: Sequelize.INTEGER,
    }
  }, {
    timestamps: false,
    tableName: 'users_projects'
  });

  db.users.belongsToMany(db.projects, { through: User_Profile });
  db.projects.belongsToMany(db.users, { through: User_Profile });

  return UserProject;
};