Custom Image Question-verification

So, I've read through the documentation and think I already know what the answer unfortunately appears to be, but…

If I wanted to create a custom, LVM-enabled image - especially using a gpt'ed vDisk with XFS filesystems on top, I'm pretty much out of luck?

Basically, was hoping to do what I do when building AMIs for AWS and templates for Azure: do a chroot-build to a block storage volume, then create an image from a snapshot of that volume. Looks like the current Linode custom image creation methods effectively render that a non-starter?