@Override
    public Object apply(String key) {
      return VALUE.equals(key) ? wrapNullable(value) : parent.apply(key);
    }
Context available when configuring an attribute on an output feature after its value has been assigned (for example
setting min/max zoom).

@param parent The parent context
@param value  Value of the attribute
planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/Contexts.java