Blur feature on android

Hello,

I'm on my 7 trial of LR on Android and I'm trying to blur a background.

All the how-tos and tutorial I find say to reduce sharpness to -100, but that is really not a big amount of blur at all, it's barely noticeable, and is not enough to make the subject stand out.

Is there really no proper blur function where I can choose the blur radius and amount?

Thanks,

F