[GATK 4.0.0.0] Allelic copy number

First, thank you very much for this great tool (GATK4). Copy number profil even with targeted sequecing are now much more accurate with or without a matched normal.
But now i wonder if it's possible to obtain allelic copy ratio or copy number for the minor allele, purity and ploidy. I didn't see any tool in GATK4.0 to do that, maybe i missed it.
I would like to know if these features already exist or are in development ?

Thank you