interface State {
  movies: {
   data: Movie[];
   loading: boolean;
  }
}

state = rxState<State>(({ set }) => {
   set({ movies: { data: [], loading: false }})
});

// in order to get movie loading we can do only 

moviesLoading = this.state.computed(s => s.movies().loading);

// I want to be able to do
moviesLoading = this.state.signal('movies.loading');
// or
moviesLoading = this.state.signal('movies', 'loading');
// or
moviesLoading = this.state.signal(['movies', 'loading']);