Null value in Environment Specific Constant

Hi Team

I am using an environment specific date constant.

This is an array of dates constant .. I want to deploy to higher environment but in such a manner that the constant should be null ( because I will be appending values in it via process model as part of logic later )

While deploying I am passing nothing in the custom properties file 

eg :  

content._a-0000ed12-853e-8000-9c18-011c48011c48_2772176.VALUE=

But when seen in higher environment it comes like this : 

I wanted it to be blank ( i.e. nothing in the constant ) .. somewhat like this : 

Is there any way we can achieve this via custom properties ?