Those offsets are relevant to the particular meter only, and can not be used to adjust a different meter.
IF you want to know the difference between the Direto and any (all?) of your other power meters, you will need to do a workout on the trainer with a power meter, record the data on 2 devices, and compare with something like the DCR analyzer tool. That will show you the relative difference of the meter and trainer at different points of the power curve.
But even when you know that, there is no way to adjust that on the trainer or in the TR app. You just have to know the difference relative between them. Ultimately, you are best to perform a FTP/Ramp test on the trainer and use that direct value for your training.
Then you need to know the difference from that to the PM’s so you can consider how different (or similar) they are to the trainer, so you can set your training appropriately for outside rides and races.
There is no “easy” button here.