You can use the "Focus Google Chrome Field" action for this.
Other than that in Chrome you can just press TAB twice and you will be in the search bar.
Furthermore I myself use the plugin "Vimium" with which you type "gi" and you will be at in the first field as well.
Google image search field Macro (v9.0.5)
Google image search field.kmmacros (1.5 KB)
