// to store data
this._storageService.store(
  key, // as string
  object // any object to store
);

// to retrieve data
this._storageService
      .get()
      .pipe(
        filter(({ key }) => key === KEY_AS_STRING),
        map((data) => {
          return JSON.parse(data.value) as Object;
        })
      )
      .subscribe((data) => {
        // use data
      });