Is there a more elegant way to use ${sep= } in a firecloud wdl?

Hi Firecloud team,

I want to write a wdl that passes N copies of the "-b" parameter for my task.

desired output:
python script.py ABC -b file1.bam -b file2.bam

right now I have

python script.py ABC -b ${sep=' -b ' bams}

Is there a more elegant way to do this? this seems a little weird because -b is specified twice

-Dimitri