Send related list fields to Action Payload Definition to consume in UI builder

[Prasun2]

Hello Everyone,
Is there a way to send fields from related list of a form to a UI builder page using action payload definition. 
In the screenshot below, I want to send order line characteristic as an input field to my UI builder page which I can read using api.context.props.fieldName. 
How do I reference multiple tables in the payload?
Any help is much appreciated

[JagjeetSingh]

You can't but here is how you can achieve what you are trying to do.

- Send your record SysID instead as parameter to your page.

- On you UI builder page you can write a transform data source or a scriptlet data source to go and query your data from related list table based on the record sysid you have.