There is a help page here that explains how
Quoted here for convenience
Kernel parameters can be appended to boot via creating a file for clr-boot-manager to use when updating kernels. For example, to add nomodeset to boot options, you would create a file in /etc/kernel/cmdline.d (as sudo):
echo 'nomodeset' | sudo tee /etc/kernel/cmdline.d/40_nomodeset.conf
The settings should be on one line with a space between them. You will need to run sudo clr-boot-manager update for the options to be appended to boot.
