Workload View - Splitting production time

Example of issue:

We are using the workload view to calculate production time to reach full capacity.

We have created a formula to run along side this which works - e.g say we have a job that takes 12 hours. We need to assign a ‘Machine’ (person on Monday) that job. Now, the production dates are 12th and 13th of January. We need 7 (effort&capacity) of the hours to be assigned to that machine on the 12th, and the remaining 5 hours to automatically be assigned on the 13th to the same machine. Currently, we set a timeline of the 12th & 13th and it splits the hours up equally across the 2 days, which is no good.

Is there any advice or guidance on how to achieve this?