Entity Designer does not work with more complex custom Datatypes

Hi, I wanted to implement custom Datatypes based on the “Units of Measurement” API (see: Units of Measurement · GitHub , unit-api/ indriya) but the designer does not accept their format since they are no simple classes but Interfaces (-> designer cannot work with Quantity , just with Quantity, but for the Datatype the part is necessary).

(Using Jmix Ver. 2.4.3, Studio Ver. 2.4.2-243)

Hi

Is it possible to attach small sample project with such custom datatype?
So we can check the case and support if possible.