no, because of https://github.com/yast/yast-bootloader/blob/ded27f528f8596c57fe68d55ca4c97789266fcde/src/modules/Bootloader.rb#L1105
see also example:
https://github.com/yast/yast-bootloader/blob/ded27f528f8596c57fe68d55ca4c97789266fcde/src/modules/Bootloader.rb#L1095
maybe I just need to explicitelly specify it in documentation