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Absolutely, the best way to dynamically capture these custom parameters and send them to Google Analytics 4 is by taking advantage of data layer variables in Google Tag Manager.
You can start by creating a data layer variable for each custom parameter. Go to Variables, create a new one, and designate it as a data layer variable. Enter the name of the parameter as the Data Layer Variable Name (e.g., “a” or “b”).
Next, include these data layer variables as fields in your Google Analytics 4 Event tag. Go to the tag, click on “More Settings” and then “Fields to Set”. Specify the name of your data layer variable (like “a” or “b”) and input the corresponding value as {{a}} or {{b}}. Be sure to do this for each custom parameter.
After implementing these changes, you’ll need to publish your updates in Google Tag Manager. Now whenever an event is pushed to the data layer, these custom parameters will be included as well and sent to Google Analytics 4. This process eliminates the need for the developers to manually update the GA4 Event tag every time they want to add a new parameter.
One important note about this approach: Keep your parameters consistent across all events in order to prevent any discrepancies in Google Analytics 4.
