Merge more than 2 charges (e.g. overnight 'Intelligent' charging slots from electricity supplier)

I'd like to be able to merge several (e.g. 4) overnight charges that are separated by non-charging periods. These are being scheduled by my electricity supplier as part of a smart tariff (Intelligent Octopus Go in the UK). I can't seem to merge more than two individual sessions, and can't merge an individual session with an already merged session.

This seems to be possible for 'drives', so I hope is easy to setup for charging ones.

More and more electricity suppliers now support these intermittent charging tariffs, so it would be good to see this supported.
Even better would be the option to merge all overnight charging automatically, and also across the evening and into the next morning.