user: Describe Bpy.Types.Greasepencilenvelopemodifier from the Blender manual or Python API, including usage steps and snippets.

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FunctionNodeReplaceString(FunctionNode) FunctionNodeRotateEuler(FunctionNode) FunctionNodeRotateRotation(FunctionNode) FunctionNodeRotateVector(FunctionNode) FunctionNodeRotationToAxisAngle(FunctionNode) FunctionNodeRotationToEuler(FunctionNode) FunctionNodeRotationToQuaternion(FunctionNode) FunctionNodeSeparateColor(FunctionNode) FunctionNodeSeparateMatrix(FunctionNode) FunctionNodeSeparateTransform(FunctionNode) FunctionNodeSliceString(FunctionNode) FunctionNodeStringLength(FunctionNode) FunctionNodeStringToValue(FunctionNode) FunctionNodeTransformDirection(FunctionNode) FunctionNodeTransformPoint(FunctionNode) FunctionNodeTransposeMatrix(FunctionNode) FunctionNodeValueToString(FunctionNode) GPENCIL_UL_annotation_layer(UIList) GPENCIL_UL_matslots(UIList) GPencilInterpolateSettings(bpy_struct) GPencilSculptGuide(bpy_struct) GPencilSculptSettings(bpy_struct) GREASE_PENCIL_UL_attributes(UIList) GREASE_PENCIL_UL_masks(UIList) GammaCrossStrip(EffectStrip) GaussianBlurStrip(EffectStrip) GeometryAttributeConstraint(Constraint) GeometryNode(NodeInternal) GeometryNodeAccumulateField(GeometryNode) GeometryNodeAttributeDomainSize(GeometryNode) GeometryNodeAttributeStatistic(GeometryNode) GeometryNodeBake(GeometryNode) GeometryNodeBlurAttribute(GeometryNode) GeometryNodeBoundBox(GeometryNode) GeometryNodeCameraInfo(GeometryNode) GeometryNodeCaptureAttribute(GeometryNode) GeometryNodeCollectionInfo(GeometryNode) GeometryNodeConvexHull(GeometryNode) GeometryNodeCornersOfEdge(GeometryNode) GeometryNodeCornersOfFace(GeometryNode) GeometryNodeCornersOfVertex(GeometryNode) GeometryNodeCurveArc(GeometryNode) GeometryNodeCurveEndpointSelection(GeometryNode) GeometryNodeCurveHandleTypeSelection(GeometryNode) GeometryNodeCurveLength(GeometryNode) GeometryNodeCurveOfPoint(GeometryNode) GeometryNodeCurvePrimitiveBezierSegment(GeometryNode) GeometryNodeCurvePrimitiveCircle(GeometryNode) GeometryNodeCurvePrimitiveLine(GeometryNode) GeometryNodeCurvePrimitiveQuadrilateral(GeometryNode) GeometryNodeCurveQuadraticBezier(GeometryNode) GeometryNodeCurveSetHandles(GeometryNode) GeometryNodeCurveSpiral(GeometryNode) GeometryNodeCurveSplineType(GeometryNode) GeometryNodeCurveStar(GeometryNode) GeometryNodeCu