is there a way I can get application/json in the Content-Type response to return application/json;charset=utf-8?

Json is always utf-8. Strictly speaking you shouldn't do that

yeah...I completely agree with you, and this is the answer I've already told the Android team asking for this

But, wanted to know if it was possible

You'd need to inject a custom interceptor.

Good to know it's possible. I'm still going to go with my original solution of: Fix it on your end, people requesting this change

thanks for the advice though

Agreed. Yada takes the view that standards are important to maintain

I learned a while ago that telling others to fix things is the least amount of work for me.

and this is one of those lovely situations where it's not only the least amount of work for me, but is also the right™ solution