Hey Omid,
The Blockly core module includes the Zelos renderer, so you don't have to do anything special to include it in your React app, simply importing "blockly" or "blockly/core" will include the renderer.
Alternately, if you're hoping to customize the Zelos renderer, I'd recommend you check out the
custom rendering codelab. You can skip the Setup step in React, as the renderer is already included in the blockly module.
Cheers,
Sam