Reuse `at_least_one_of` set of params on multiple named param blocks

Let's say one would like to "inherit" a declared at_least_one_of set of params on the main params block of an endpoint:

helpers do
  params :x_params do
    at_least_one_of :x
  end
  
  params :y_params do
    at_least_one_of :y
  end
end

params do
  use :x_params
  use :y_params
end

In that case, I'd expect a "merge" between both, generating something like a at_least_one_of :x, :y at the end.

My current practical use case involves much more params, and endpoints, that's why creating multiple constants and manually merging them would not be a elegant solution for reusing.

One thing that came in mind is allowing use method to receive arguments (optional key?) that would set values available only on the scope of, let's say, params :x_params block. But i'm totally unaware if it's feasible.

Would be happy to know alternatives, or even some guidance for a future contribution.

Start by tracing the params, use, and at_least_one_of entry points in Grape's parameter DSL and review existing tests for named parameter blocks. Clarify the intended merge behavior and scope of any values passed to use. Done means reusable blocks combine their at_least_one_of declarations correctly without breaking existing parameter definitions.