Hey Anaelle,
It is currently possible both on Polkassembly and Subsquare to do scheduled payouts. Although the PA UI seems much more intuitive for this atm.
We are interested in pushing milestone-based scheduled payout referenda as a whole though as we see them highly beneficial to treasury efficiency.
We currently have the following discussion post up on Polkadot to gauge interest: Polkassembly - Milestone-Based Payouts at Scale: Treasury Guardian Tool for Efficient Polkadot Treasury Spending #3337