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For this you need to customize your workflow as below
1. Create Custom Notification Message
Here, the body can be Text (if required simple reject message) or HTML (if required any HTML type message like, bold, color, tables etc.,)
2. Create Custom notification
For this notification above custom message is assigned. In Performer Value of 'Note' tab, mention to whom you want to sent the reject notification (This can be constant value or from any workflow attribute).
It looks like below
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