There’s not even academical consensus what value actually is, AFAIK. Do preasts add value to anything with their labour? If not: Do social counsellors? What if a priest acts as a counsellor? Ask different economists with their theories of value and you’ll get several answers.
Economic theories aren’t as rigid as theories from the natural sciences or mathematics. They are dependent on the culture in which they are perceived. A non-capitalist society would have different theories or value (or none at all) than we do.