public List<CustomPropertyDefinitionProvider<M>> getCustomDefinitionProviders() {
        return Collections.unmodifiableList(this.customDefinitionProviders);
    }
Getter for the applicable custom property definition provider.

@return providers for certain custom definitions by-passing the default schema generation to some extent
jsonschema-generator/src/main/java/com/github/victools/jsonschema/generator/SchemaGeneratorConfigPart.java