class_docstr: Plots layout specification used in constructing subplots figure.
code: def as_dict(self) -> Dict:
      return _specs_to_dict(self.__props)
  
imports: from typing import Dict
  from lets_plot.plot.core import DummySpec
  from lets_plot.plot.core import FeatureSpec
  from lets_plot.plot.core import FeatureSpecArray
  from lets_plot.plot.core import _specs_to_dict
  from lets_plot.plot.core import _theme_dicts_merge
  from lets_plot.plot.core import _to_svg, _to_html, _export_as_raster
label_desc: Use image node_id 2 for calling the SupPlotsLayoutSpec obj's underlying member method code with example usage: obj.as_dict() and returns: _specs_to_dict