How to run each test case in a separate transaction using slonik?

Question

I'm trying to run tests in parallel using slonik. Each jest worker creates his own pool. All SQL queries in one test case must be executed inside a separate transaction. This will isolate jest workers from each other.

The global setup script (setupFilesAfterEnv) might look like this:

let pool: DatabasePool;
let connection: Connection;
let server: http.Server;

beforeAll(async () => {
  pool = await createPool();
});

afterAll(async () => {
  await pool.end();
});

beforeEach(async () => {
  connection = await pool.connect(); // This method doesn't exist
  await connection.query(sql.unsafe`START TRANSACTION`);
  server = await createServer(connection, PORT); // The server will execute all SQL queries inside the same transaction
});

afterEach(async () => {
  await new Promise((resolve) => {
    server.close(resolve);
  });
  await connection.query(sql.unsafe`ROLLBACK`);
  await connection.release();
});

The connect method allows the connection to be used only inside the callback function:

pool.connect(async (connection) => {
  await connection.query(sql.unsafe`START TRANSACTION`);
  // ...
  await connection.query(sql.unsafe`ROLLBACK`);
});

I need to somehow create a new connection and save it globally in order to run START TRANSACTION and ROLLBACK inside the callbacks beforeEach and afterEach respectively.

Is it possible?