You’ll need the following Logic-App workflow to group the hourly records by borderID and format them into a single text block.
If you use this code/logic, the problem will be solved and you can easily use the final string to send an email (for example through the “Send an email” action).

The full working Logic-App JSON is available here:

https://github.com/rambhuvanparmarsingh-dev/StackoverflowSolutions/blob/89b279996717a9dbeec09216ef21549cd4870cb7/Logic%20app%20-%20parse%20JSON%20to%20compose%20the%20email%20body