As stated in the documentation:

An easy-to-use web interface

Looker Studio is designed to be intuitive and easy to use. The report editor features simple drag-and-drop objects with fully custom property panels and a snap-to-grid canvas.

An alternative to your approach could be using Custom Queries.

See also:

• Looker Studio - Getting Started - Write Custom Queries - Do it yourself #2
• Custom query, the solution for your Looker Studio dashboards