How to create database table in power bi service using push dataset Rest API

Hello All, 

Please help me to create a dataset in power bi service based on SQL database 3 tables . i can see pushdataset API for static table creation but i think, after creating gateway for datasource then we can create a tables along with relationship . but i dont know how to achieve it . 

Can anyone please help in done this , please share instructions or sample script to achieve this. 

Thanks in advance.