API for Plan Usage Statistics

I’d like to be able to retrieve my Plan Usage Statistics - the same data that’s visible on the “Apps” page - but in JSON format:

API Usage
7 of 5,000 available
1 of 8 available
106 of 50,000 available
Using 0.00% (4.9 KB) of your 10 GB.

I’d like this so that we can build an auto-alert mechanism using Integromat that will email us when we’re in danger of running out of allowance (or when it suddenly changes).