Dual booting with OpenWrt

I left some space on my hard disk after installing OpenWrt x86 with the idea of installing an additional OS at some point. Once it's installed do I manually have to add it to the Grub menu or is there any way to automatically generate menu entries for Grub?

https://openwrt.org/packages/pkgdata/grub2-editenv

I tried that but couldn't figure out how to use it.

Eventually installed Grub on Arch Linux and copied the menuentries from OpenWrt to Arch's grub.cfg and it worked!

If your problem is solved, please consider marking this topic as [Solved]. (Click the pencil behind the topic...)

Is there an option to select '[Solved]' ? I didn't see one.

As written above:

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