While there is an official fix for Mach-E’s 12v issues there is a Ford Pass app (unofficial of course) for Home Assistant that allows you to track and set a notification for the 12v battery. (Along with a host of other things.)
The login process is not super easy but once added the level of integration is excellent and, best of all, includes a readout of the 12v status. From there, setting up a automation triggered by the battery level is fairly straightforward. At the moment, I have it set to notify if the level drops below 40%. Usually the battery cycles around the %60 level, not usually dropping much below there so %40 seems like a good buffer.
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