nameModifier property
Use Name modifier (NameModifier) to have the service add a string to the end of each output filename. You specify the base filename as part of your destination URI. When you create multiple outputs in the same output group, Name modifier (NameModifier) is required. Name modifier also accepts format identifiers. For DASH ISO outputs, if you use the format identifiers $Number$ or $Time$ in one output, you must use them in the same way in all outputs of the output group.
Implementation
final String? nameModifier;