code: def __init__(self, varstore, fvar_axes, location={}):
      self.fvar_axes = fvar_axes
      assert varstore is None or varstore.Format == 1
      self._varData = varstore.VarData if varstore else []
      self._regions = varstore.VarRegionList.Region if varstore else []
      self.setLocation(location)
  
imports: from fontTools.misc.roundTools import noRound, otRound
  from fontTools.misc.intTools import bit_count
  from fontTools.ttLib.tables import otTables
  from fontTools.varLib.models import supportScalar
  from fontTools.varLib.builder import buildVarRegionList, buildVarStore, buildVarRegion, buildVarData
  from functools import partial
  from collections import defaultdict
  from heapq import heappush, heappop
label_desc: Use image node_id 1 to create a new VarStoreInstancer object from inherited base classes: object with example: obj = VarStoreInstancer(varstore, fvar_axes, location)