[Urgent] HI all, anyone know how to set default value on pickerFieldCustom ?

[Urgent] HI all, anyone know how to set default value on pickerFieldCustom ?
Use case :
I want to edit data from related action on record. On of the editable data is pickerfieldcustom.
When I start related action, It will automatically set default value on the pickerfieldcustom.
I've tried put the value on Data Input Value, but its not work.

Error :
Expression evaluation error at function a!taskui_taskRejectionReassignment: Invalid index: Cannot index property 'email' of type Text into type List of Variant

Thanks before for your kindly help.

OriginalPostID-139867

OriginalPostID-139867