i do neither use nor about lvm, however, something like this in e.g.
/lib/udev/rules.d/99-btrfs.rules should come close to it:
---snip---
SUBSYSTEM!="block", GOTO="btrfs_end"
ENV{ID_FS_TYPE}!="LVM2_member|LVM1_member", GOTO="btrfs_lvm_end"
RUN+="/sbin/modprobe btrfs"
RUN+="/sbin/btrfs device scan $env{DEVNAME}"
LABEL="btfs_lvm_end"
---snap---
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