Add an option to customize Email Subject and Body on Notification Task

Could you please add an option to specify the email Subject and email body?


The email subject and body can use templates. 


Example 1:  I have a Build task with the name "Strategy Generation". I want to be notified if this task is completed and see how many strategies were generated. 
Subject: {Task Name} Finish: {Project Name} {Symbol} {Timeframe}
Body: {Task Name} has finished with {Number of Strategies} strategies
Task Dropdown: Strategy Generation


The generated email based on the template above will be 
Subject: Build Finish: Trend Following USDJPY15M
Body: Build has finished with 1000 strategies