mocking server for SSR react app e2e tests with cypress.io

I'm building a single page web application (SPA) with server side rendering (SSR).

We have a node backend API which is called both from the node server during SSR and from the browser after initial rendering.

I want to write e2e tests that configures API responses (like with nock) and work both with browser calls and SSR server calls. some pseudo-code :

it('loads some page (SSR mode)', () => {
  mockAPI.response('/some-path', {text: "some text"}); // here i configure the mock server response
  browser.load('/some-other-page'); // hit server for SSR response
  expect(myPage).toContain('some text');
})   

it('loads some other page (SPA mode)', () => {
  mockAPI.response('/some-path', {text: "some other text"}); // here i configure another response for the same call
  browser.click('#some-link'); // loads another page client side only : no SSR here
  expect(myPage).toContain('some other text');
})   

Currently Cypress allows me to mock fetch on the browser but not on the server.

Is there anything to achieve that ? Preferably with node libs.