API - getting amount of kw charged per hour during a charge session

Have a use case where I'm trying to calculate my exact cost of charging at home, the price I pay changes at 30 minute intervals (a lot of people in the UK are on one of Octopus' tarrifs)

On the Monta app I can see the charge broken down in hourly intervals, but this data isn't visible in the API. My request would be for this to be added, and if possible at 30min intervals.