How to add new project/budget related column in Expense approval notification

I suppose to add budget available amount in Expense approval notification where the Budget and Task names are displaying in the Expense Approval notification. I tried to add some static working here but it is not reflecting in the approval notification.

Note: I have updated the template "/Financials/Workflow Notifications/Expenses/Expenses" through customization option.

Kindly let me know which template we need to customize to add new project related column in the Expense Approval Notification.