How to read boot logs when stuck in a boot loop?

My Sony Xperia 1 V is using an unofficial build of LineageOS (rooted with Magisk) and after a few weeks of working fine, became stuck in a bootloop. I can access Fastboot and Recovery fine, and I still have the PIN and all my fingers (enrolled for fingerprints). LineageOS's Recovery also allows me to start a root shell via ADB from a PC connected with a USB cable, as well as modify the system partition (either directly when mounted read-write, or via ADB sideload). **How can I read the logs from the regular boot?** I cannot access my data partition (yet ). When I'm on an ADB shell in Recovery, there is no /proc/last_kmsg and my /sys/fs/pstore is mounted but empty. Can I somehow force the system to log to some specific location while booting (or maybe it *does* log somewhere but I don't know where to look)? Or maybe instead I could get rid of the splash boot animation to see the logs instead of it? I believe I can add some kernel arguments by carefully writing them in the header block of vendor_boot_a and vendor_boot_b partitions.