Microservices : aggregate data : is there some good patterns?

I have the following use case for a micro-services architecture.

My issue is that in the current situation I have 3 microservices, and a APIGateway.

At the end, the gateway has to do a lot of queries before aggregation (composing) the data from the 3 services. Because the 3 microservices are only providing basic set of datas.

Please, check the picture for more details !

Is it a good pattern ? Is there other pattern ?