I don’t think that much specificity is required. I may be wring. Do you have USSC precedent?
There would be no SCOTUS precedent until some Congress were lilly livered enough to try it and were then challenged on it.
So far they have always seemed to pass a declaration of war/ authorization for the use of force/ or whatnot directly.
Specificity is not there, but it (IMHO) needs to be explicitly stated, not implicit in continued funding.