I want to override OOTB mutifield to customize the multifield persistence (I want to store the content in a custom format - not as a json and not as child nodes). I tried overriding OOTB multifield render.jsp and unable to do so. I tried extending by sling:resourceSuperType ..but it doesnt seem to work.. then I read about granite:finalArea. on this URL (Adobe Experience Manager Help | Sustainable Upgrades ).. u cant overlay/override if mixintype finalArea is defined... so any alternate solution?? Cant we override multifield in 6.4???