"Safety" mode - always be able to get to a backup fast charger

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/safety-mode-always-be-able-to-get-to-a-backup-fast-charger/
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I would like to be able to switch on a mode that would plan my route but also make sure that I never turn up at a fast charger without enough charge to get me to another fast charger if that charger is not functioning. This should be the default mode, frankly. I have been lucky so far but one day my luck will run out… Not so important where fast chargers are fairly "dense" but certainly so where they are less available.