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In order to get extra dimensions in Google Analytics 4 (GA4) for platforms other than web or Android, you would need to set up custom dimensions. This involves sending custom parameters in your events that can be registered in GA4 as custom definitions. In the JSON message that you send for an event, you can include these custom parameters. For example, to add a custom dimension for user’s preferred language, you might include a field in your JSON message like “preferred_language”: “English”. After you’ve included these custom parameters in your events, you would need to go to the GA4 interface, navigate to ‘Custom Definitions’ under ‘Data’ in the left-hand menu, and then register these custom parameters as either custom dimensions or metrics, as appropriate. It’s important that the name of these custom definitions exactly matches the custom parameter names sent in your JSON messages. Once set up, these custom dimensions or metrics will be available for use in your reports. For further details, be sure to refer to the GA4 documentation or contact Google Support.
