It is unlikely to work the way you want. There is a MTU limit so data is split into 'random' packets. So you may not get complete line in one write/notification anyway due to that.
Guaranteed MTU is 21 bytes, anything above that depends on negotiation between two connected devices.
Can't you just add what you get to some string/buffer and then just parse and remove complete line(s) from beginning of that line by line?
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