Yes, but indirectly and retroactively. Record Label budgets have to allow this.
Indirectly
Voluntary input should translate to more music consumption. The more music consumption, the higher the Record Label revenue. Once budgets allow the Record Label will start hiring.
Retroactively
Volunteers should keep track of their own hours. The Record Label will retroactively compensate up to 110% of the hourly nominal wage of volunteer residence country.