Angular - react to changes in rxResource()

How one can react to changes / perform side-effects when rxResource receives .value() instead of using effect()?

Current approach in component:

constructor() {
this.service.setItemId(1); //setting signal
effect(() => // work with data from async post request
}


in service:

resource$ = rxResource({
request: () => this.itemID$(), // signal
loader: ({ request: id }) => {
return this.http.post('http://');
}
});

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