Host specific options can be added by raw static-mapping-parameters, but this is ugly, and cannot add string with quote.
this new parameter add options node tag.
static-mapping foo { ip-address 192.168.50.43 mac-address 00:15:17:44:2D:AA option pxelinux.configfile { value pxelinux.cfg/01-00-15-17-44-2d-aa } }
the generated result:
host VLAN7_foo { fixed-address 192.168.50.43; hardware ethernet 00:15:17:44:2D:AA; option pxelinux.configfile "pxelinux.cfg/01-00-15-17-44-2d-aa"; }
https://github.com/Elbandi/vyos-1x/commit/91bc03219c3e62c1b3b328f28198c6342e9b4859