docstr: Generate ColumnDataSource dictionary for segment separation lines.
code: def _get_ymarks_data(self, order_ann, bins_ann):
      """
      Generate ColumnDataSource dictionary for segment separation lines.
      """
      if not self.ymarks:
          return dict(radius=[])
  
      radius = self._get_markers(self.ymarks, order_ann, bins_ann)
  
      return dict(radius=radius)
  
imports: import numpy
  import param
  from bokeh.models.glyphs import AnnularWedge
  from ...core.data import GridInterface
  from ...core.spaces import HoloMap
  from ...core.util import dimension_sanitizer, is_nan
  from .element import ColorbarPlot, CompositeElementPlot
  from .selection import BokehOverlaySelectionDisplay
  from .styles import base_properties, fill_properties, line_properties, text_properties
label_desc: Use image node_id 15 for calling the RadialHeatMapPlot obj's underlying member method code with example usage: obj._get_ymarks_data(order_ann, bins_ann) and returns: dict, dict