There's a closed pull request on the void-packages repository

gummiboot : patched to permit kernel cmdline parameter passing.
https://github.com/void-linux/void-packages/pull/23412

Description:
The actual version doesn't work. See [here](https://github.com/systemd/systemd/blob/master/src/boot/efi/stub.c) at 66 line. Tested on my machine (Dell xps 9380)