How to boot an ISO from ventoy_grub.cfg menu

[Marckov]

F6 is designed for custom grub2 menu.
Ventoy's boot function need many many conditions and some function must be run in specified order.
They are not desiged to export for custom menu.
So F6 custom grub2 menu can not use internal Ventoy boot function. Can only use common grub2 command.

Is there any other way to add custom menu entries ? i've more than a single custom menu to add...how can this be achieved?