You're aiming to customize the "Export members" functionality in Dynamics 365 Customer Insights - Journeys to include additional fields. Unfortunately, direct modification of the standard "Export members" button to add custom fields is not supported.
However, there are effective workarounds and alternative approaches to achieve your goal:
Understanding the Limitation:
Workarounds and Solutions:
Key Recommendations:
By using these workarounds, you can effectively export members with your custom fields from Dynamics 365 Customer Insights - Journeys.