How to send requests to custom pocketbase routes, using the pocketbase javascript sdk?

I am trying to find a 'native' way to send post requests to my pocketbase server, from my svelte frontend :

main.go:

    app.OnBeforeServe().Add(func(e *core.ServeEvent) error {
        e.Router.AddRoute(echo.Route{
            Method: http.MethodPost,
            Path: "/api/myRoute",
            Handler: func(c echo.Context) error {
                // custom logic here: compute custom_value using parameters
                custom_value := "cool_value"
                return c.String(200, custom_value)
            },
        })
        return nil
    })

I would like to do something similar to the following :

Frontend.ts:

  onMount(async () => {
    // ask server for information based on a variable: example
    const example = "test";
    const example_reply = await pb.route(POST, '/api/myRoute', /*here, I would have to specify the fact that example is a form value of the POST request*/ example);
    // use example_reply
    if (example_reply === "cool_value") {
       console.log('got what I expected');
    } else {
       console.log('wrong!!!');
    }
  }

Does the function I am looking for exist, or should I use raw JS to fetch information from my custom routes ?

I have tried to use raw javascript to send a post request, which works but does not use the pocketbase package. :

const response = await fetch('/api/example', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ example: "test" }), // Convert the input to JSON
      });