A deltaR formula available in TTree::Draw?

Hello all,

Sorry if it’s a naive question, but is there a built-in formula I can use in TTree::Draw to compute deltaR values between to vectors in (eta,phi) coordinates ?
I have plain ntuple variables, and need something like

tree->Draw("deltaR(V1_eta,V1_phi,V2_eta,V2_phi)") where deltaR(eta1,phi1,eta2,phi2) = sqrt( (eta1-eta2)^2 + deltaPhi(ph1,phi2)^2 )
With, obviously deltaPhi NOT equals to (phi1-phi2).

I couldn’t find this in TMath, for example