GFTrackEvent with custom values

I need some help with extending the “GFTrackEvent” event by adding additional fields. Currently, after submitting the form, the following data is sent:

I need to include two more custom fields in this event. What method can I use to extend it? I have tried looking for solutions, but unfortunately, I haven’t been able to integrate it properly. I can trigger it as a separate custom event after form submission, but the client would like to have everything together.

Thank you for your advice.

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