In the plan section, can I change the field that is used as the end date of my gant (due date)? I would like a custom field created by me to be used as the end date of my gant.
I would guess "no", and instead have you considered the idea of using an automation rule which would update Due Date to match when your custom field value changes? Then the Gantt/roadmap would update automagically.
If interested, please look here for information to get you started with the automation rules:
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