How to (can i?) load Cypress fixture inside intercept based on request data?

[mateNemeth]

I have a bunch of fixtures generated by the backend, and named based on the hash of the request body. I am trying to find a way to load fixtures dynamically based on the sent request, something like this:

cy.intercept('POST', '**/login', (req) => {
    const hash = md5(req.body);
    cy.fixture(`${hash}.json`).then(data => {
        req.reply(res => {
            res.statusCode = data.statusCode;
            res.body = data.body;
        })
    })
}).as('response');

cy.visit("/login");

cy.get('input[name="email"]').type('test@email.com');
cy.get('input[name="password"]').type('wrongpassword');
        
cy.contains('button', 'Login').click();

cy.wait('@response');

cy.contains('Invalid credentials.');

But every time I try to load a fixture inside an intercept, I get the following error:

The following error originated from your test code, not from Cypress.

  > A request callback passed to cy.intercept() threw an error while intercepting a request:

Cypress detected that you returned a promise from a command while also invoking one or more cy commands in that promise.

The command that returned the promise was:

  > cy.wait()

The cy command you invoked inside the promise was:

  > cy.fixture()

Is there any way, I could load fixtures dynamically based on something inside the request?