What you need to do will depend on some things. For example, is everything always the same in the array you listed except the value you want to extract? If so, do this:
The expression in the compose action is: replace(replace(variables('Array'),'["Template:Approval_By_Email_Result_Reject_en%0A@@Modify@@:[","',''), '","]]"]', '')
For the value of the initialize variable action, you'll pass your array into it so it converts to a string. You may need to adjust the expression if what goes into the variable is not exactly what you posted.
If the content on the left and right of what you want to extract can vary, this gets much more challenging.
Here is a run of the flow to show it works:
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