I have a 'Buildings' and 'Regions' DOM definition, where the Buildings definition has a DomInstanceFieldDescriptor to the Regions definition.
When showing a form on a low-code app to add a new building, the Region field has a drop-down which contains GUIDs i.e. the instances into the Regions definition.
Is there any easy possibility to have another field of that linked instance into the drop-down? Ideally, I'd like to show the Description column into the drop-down.
I believe your looking for the DomInstanceValueFieldDescriptor (see docs).
However, compared to the DomInstanceFieldDescriptor, this one also references a specific value of that DomInstance
Note that you could also define a name definition (see docs), which provides a meaningful display name for your DOM instance.