If you want to remove the border around the label, you will need to implement a custom renderer for Android.
Override the OnElementChanged method and assign a custom class to the LaberRenderer for its series. I have created a sample to show you how the renderer could be implemented. Please download the attached project and test it on your side. Note that this is just a sample and you may need to extend it further to match the exact requirements you have. Custom implementation is out of the Telerik support scope.
I hope the provided information was helpful.
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