Bootloader unlock without losing data, is it possible?

I am already unlocked and rooted, but I would like to relock the bootloader assuming that I can unlock it for future updates without losing data. The Nexus 5 had a boot locker app in the App Store which allowed this, but I do not find an option for the 6 P. I'm thinking it may not be possible but thought I would ask. Thank you in advance

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