[yocto] use of variables in wic files

[Andrea Galbusera]

Hi,

Is there any way to reference bitbake variable within the wic file
syntax? Got to this question after a wic file of mine recently broke
due to a u-boot artifact changing its name after an upstream update of
the u-boot recipe. The wic had the artifact's name hardcoded as a
parameter to the rawcopy plugin. Could I have been referencing the
u-boot artifact via UBOOT_BINARY variable instead?