It is clear that A degrades the value of B but it is not clear to what such degradation amounts.
I am trying to say that the degradation is for sure but we are not sure what [the amount of] that degradation exactly is. "Amounts to" might as well mean "of what sort/character". So it is not just about the degree or amount. The second sense is essential in my sentence.
I assume the usage of "amounts to" in that sense is idiomatic. If not, please let me know.
But my main question is whether using it in the above form is idiomatic. Due to some biases, I couldn't find reliable examples of such a usage on the web, and some principal sources (Cambridge Dictionary, Collins Dictionary, and Merriam Webster Dictionary) do not give such examples.
If you think such a usage is not idiomatic or is ambiguous, I appreciate your suggestion of verbs to replace "amount".