Most form widgets of BootsFaces support the JSF converters. For some reason, this feature has been added to BootsFaces late, so chances are we've missed a component. If you encounter such a component, please open a but report at https://github.com/TheCoder4eu/BootsFaces-OSP/issues.
Converters are used the way you're used from standard JSF: either by defining a <f:converter /> tag,
or by providing the id of the converter with the converter attribute of the input field.
This example has been inspired by https://memorynotfound.com/using-custom-converter-for-hselectonemenu/.