It is possible with a custom UI action.
Create a Related List Declarative Action as shown in the screenshot. Enter your table name if you want this to be visible only on a specific related list table or set it to "Global" and add a condition for which table you want this to be visible on.
In the "Specify client script" field, use the OOB Action Payload Definition (Export) shown in the screenshot.
That's it.
A few things to remember:
- Since the action is on the Global table, this UI action will be visible on every related list. You will need to add a visibility condition to the UI action if you don't want to visible on all related list.
- Check if it follows the related list filter condition. We have implemented this in the Zurich version of ServiceNow. I'm not sure about previous versions.
For information only: The "Export" payload definition is used in the OOB "Export" button on the list view. We copied the same configuration to the related list button. You don't need to implement any API or script. I have added the screenshot for reference, copy the same.
Action Payload Definition (search, don't create/update)
Related List Declarative Action
Regards
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