Sequelize many-to-many insert into join table

Hello folks, this is probably a well known problem, but I am having a hard time figuring it out from the docs and forums.
So, my application, when a button on the front end is pressed, should flag the current item as favorite or not. I have made it in Sequelize following the docs, and it led me to the following models:
users.model.js

const { DataTypes } = require("sequelize");
const db = require("../config/db.config");
const bcrypt = require("bcrypt");

const Users = db.define("User", {
  username: {
    type: DataTypes.STRING(255),
  },
  email: {
    type: DataTypes.STRING(255),
  },
  password: {
    type: DataTypes.STRING,
  },
});

Users.beforeCreate("save", async function (next) {
  const salt = await bcrypt.genSalt();
  this.password = await bcrypt.hash(this.password, salt);
  next();
});

module.exports = Users;

item.model.js

const { DataTypes } = require("sequelize");
const db = require("../config/db.config");

const Items = db.define("Item", {
  
  title: {
    type: DataTypes.STRING(255),
  },
  geolocation: {
    type: DataTypes.GEOMETRY("POINT"),
  },
});

module.exports = Items;

and their associations:

associations.Items.belongsToMany(associations.Users, {
  through: "Favorites",
});
associations.Users.belongsToMany(associations.Items, {
  through: "Favorites",
});

Now of course, as a result, the junction table has been automatically been created, however how can I access it to grab the current user, grab the item id and setting up a endpoint to create a favorite association in the junction table? As I mentioned, the Sequelize docs are confusing about it

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