Angular RXJS Combine Data in Observable

	configsWithP(): any {
		const configs = this.configsService.getConfigsList;
		const product = (id) => this.bcProductService.getProductById(id);
		this.test_configs = configs.pipe(flatMap( configs_ret => {
			const final = (configs_ret as any[]).map(config => product(config.id));
			return zip(...final, (...args: any[]) => args).map(products => {
				for (let i = 0; i < (configs_ret as any[]).length; i++) {
					configs_ret[i]['p']=products[i].data;
				}
				return configs_ret;
			});
		}));
		this.test_configs.subscribe(configss=> {
			this.configs = configss;
			this.merged = true;
			this.configsExist = true;
			this.configsService.Configs = configss;
		});
	}