While developing a VS Code theme specifically for Dart files and trying to set styles for each semantic token type, I found that no distinction can be made between top-level declarations and instance (class-based) ones, since they both have the same token type (property.declaration):

Inspecting a top-level variable:

Inspecting an instance field:

This is why they are both colored the same.

This distinction is made, for example in IntelliJ themes, as can be seen here:

Is there any way to be able to have a different semantic token type for this? For example, adding a instance modifier for declarations, getters and setters that are defined inside a class?