You can use Fusion 360 to generate G-Code for your machine. Simply install the correct Post Processor :
Click on your Name in the top-right corner, and then on Preferences:
Click on Manufacturing on the left, and then make sure the checkmark is set next to Enable Cloud Libraries
Open your Assets library
Go into the CAMPosts folder
Click Upload, select the downloaded OpenbuildsFusion360PostGrbl.cps file and Upload it
Proceed to setup your CAD/Toolpaths as you would normally, generate the Toolpaths, and then Post Process:
=== 3.1 Post: Use Cloud Posts
Click Setup > Use Cloud Posts