Answer from WPBakery Support:
“I am afraid, the standard grid element only supports text field output and does not support ACF image field. However, we do have many third party add-ons: https://wpbakery.com/addons/ which might have such a functionality as many of them have their own grids. Do make sure that you re-confirm the same with the respective add-on author, before making any purchase.”
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