We don't have any agreements here, obviously I'm thinking slam.
5♠ sounds like an alternate place to play so I don't want to make that bid with Jxx support for partner.
I can just bid a boring 6♥ but what does 6♣ or 6♦ say? If 6♦ shows simply first round control in diamonds, why
would I be forcing to slam? So, could it show 1st round diamond and spade control?
Or I think perhaps better still, what if 6♣ says partner I want to play 6♥ and have the other 2 suits covered, if
you have 1st round club control you may want to consider 7?
As it is, I bid 6♦ and expect we'll play in 6♥.