I have one, but I do not have a place to put it for download for everyone.
EDIT: Creating the image is rather simple:
- Boot into bootloader
adb reboot bootloader - Start fastboot with recovery image (i.e. Linageos 20 recovery)
fastboot boot lineage-20231001-recovery-FP4.img - get the boot image (for example from slot a)
dd if=/dev/block/by-name/boot_a /tmp/boot_a.img - Get boot image
adb get /tmp/boot_a.img - reboot and push boot image to download dir
adb push boot_a.img /sdcard/Download/ - Install magisk into the image under /sdcard/Download/
- Check image file created by magisk install under /sdcard/Download/ and download it via adb
adb pull /sdcard/Download/FILENAME_MAGISK.img - Reboot into bootloader again and boot the rooted image
fastboot boot FILENAME_MAGISK.img - Install magisk again with the direct method
- Reboot and done
