ReadBackedPhasing of somatic and germline variants?

Hi all,

I'd like to know which germline variants are proximal to and on the same chromosome as detected somatic variants. Is there an out-of-the-box way to phase germline and somatic variants to one another? If not, do you see a role for GATK ReadBackedPhasing?

Thanks for your help and my apologies if this has been answered already, I couldn't find anything related.

-M