Studying the gluon TMDs with $J\mathrm{/}\psi$- and $\mathrm{{\rm Y}}$-pair production at the LHC

We report on how $J\mathrm{/}\psi$- and $\mathrm{{\rm Y}}$-pair production are promising processes to access the polarised and unpolarised gluon TMDs at the LHC. We present the formalism used, as well as resulting observables that could be extracted from data.