public DozerBeanMapperBuilder withCustomConverterWithId(String converterId, CustomConverter converter) {
        this.customConvertersWithId.put(converterId, converter);
        return this;
    }
Registers a {@link CustomConverter} which can be referenced in mapping by provided ID.
Consecutive calls of this method with the same ID will override previously provided value.
<p>
Converter instances provided this way are considered stateful and will not be initialized for each mapping.
<p>
By default, no converters with IDs are registered.

@param converterId unique ID of the converter, used as reference in mappings.
@param converter   converter to be used for provided ID.
@return modified builder to be further configured.
core/src/main/java/com/github/dozermapper/core/DozerBeanMapperBuilder.java