allow
If true, position annotation on buildings' (both fill extrusions and models) rooftops. When adding new annotations, if `allowZElevate` is not explicitly set, default value `false` will be applied. When updating existing annotations, if `allowZElevate` is not explicitly set, the current value will be retained. Note: In case the annotation is associated with a symbol layer, and the annotation's `allowZElevate` is not explicitly set, its `allowZElevate` value will be overridden by the symbol layer's `symbol-z-elevate` value.