Spline problems and solutions in Meta Quest

Unity Engine
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  1. Can Splines be drawn based on Line Renderer or existing Mesh?
  2. In Meta Quest i have changed the cursor of the hand to a circle nested inside a Spline with the shape of a cylinder. Please help me how to change the shape of the Spline when touching the cursor. For example: when the hand pushes up, the Spline segment also pops up, like dragging the tangent up in the Spline Editor. Thanks in advance!