Alternatively you can use symbol-gen package to generate ctags symbols file for your project based on the options found in .ctags file. You can install it from Atom Package Manager by: apm install symbol-gen. Then hit CMD-Alt-G to generate tags file for your project.
After following above, you can use Go To Declaration option from the context menu.
On macOS you can use also use the following keyboard shortcuts:
CMD-R to jump to a function/method in the current ,editor