How to add data in two tables using sequelize

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database

PostgreSQL

Node.js

If user created an account, he can choose his languages, we have two tables:
1. languages: language_id, language_name
2. user_languages: user_id, language_id

If the user chose languages already exists, we will add it to the 'user_languages' table
If it is not, we will add it first to the 'languages' table then link the id with user_id in the 'user_languages' table

How can I do this with sequelize?


What I have tried:

const createLanguages = (data) => Languages.create(data);
const createUserLanguages = (data) => UserLanguages.create(data);