We are trying to define a component, and we wonder if it would be possible to define the fragmentDefintion as a @Template property, as explained in the docs .

We checked the Blossom module code and didn't find anything related with the DynamicFragmentDefinition, so maybe it's still not implemented.

Workaround
We're using the @PreRegister annotation to define this property:

@PreRegister
public void register(BlossomTemplateDefinition templateDefinition) {
  FragmentDefinition fragmentDefinition = new DynamicFragmentDefinition();
  templateDefinition.setFragmentDefinition(fragmentDefinition);
}