My understanding is it is configuring the KeePass application configuration (~/.config/Keepass/KeePass.config.xml) to perform an export via KeePass' own scripti

My understanding is it is configuring the KeePass application configuration (~/.config/Keepass/KeePass.config.xml) to perform an export via KeePass' own scripting/configuration mechanism. It's not the kdbx file itself being modified here. KeePassXC has not replicated the automation ("Triggers") system of KeePass, so there's unlikely to be a similar action to take using KeePassXC's config file