Hello and welcome to Spine!
Spine has a thing called meshes and deformation and would like to use meshes instead of deformation.
I am not sure I understood your question correctly, so please ask again if the answer does not make any sense to you.
What Spine does is start with meshes and either deform these meshes via bone transformations or additionally via free-form deformation. If you do not want any free-form deformation, then you can simply use only bone-based skeletal animation.
Is it any way possible to export my Spine mesh animations to unity for IOS and Android?
Assets exported from Spine can be used for any platform, thus also including iOS and Android.
What do you mean by this line?