Scaling UMA avatar with exact value

I am wondering is there a way for scaling UMA avatar with exact value ?

For example : how can I scale the avatar’s height to 190cm ?
how can I scale the avatar’s arm length to 80cm?

PS:Is there any 3DParty plugin provide this function for UMA ?

I think all the calculations you need to configure the sizes of your UMA’s are located in the DNA directory (Files called like “HumanMaleDNAConverterBehaviour”). In those files you can adjust all the skeleton components and their heights (with the skeleton.SetScale properties). Try to play with your own custom file.