How to set up chainloader in GRUB to boot OSX from hard drive to GPT?

Question

macOS

There are 2 HDDs on the PC and there are several operating systems:
1 hard drive in MBR, it has linux and grub2 on it
.
Previously, this config worked: /etc/grub.d/40_custom

menuentry "OSX" {
    insmod hfsplus
    set root="(hd1,msdos1)"
    chainloader (hd1,msdos1)/usr/standalone/i386/boot0
}

The partition with OS X (it's the first on hd1) has Chameleon.
I've tried changing msdos1 to gpt1, doesn't help. How to reconfigure?

Answer 1

I answer myself: it was necessary to change msdos to gpt in the config, and add
insmod part_gpt