Please describe your 🚀 feature request.
The current Segmentation Based Volume Creation only supports "hard" classes. Additionally it should be possible to import fractional segmentations, where a voxel can have fractions of different classes (like 50% blood, 50% background).

Describe the solution you'd like
We could make INPUT_SEGMENTATION_VOLUME either accept a (x, y, z)-shaped int array for hard segmentations or a (c, x, y, z)-shaped float array for fuzzy ones (c should mirror the classes given in SEGMENTATION_CLASS_MAPPING).