I have not found a straightforward way to make the Scheduler card work well with climate entities that use two setpoint temps. In fact I don’t love its interface to Climate entities overall. I’m sure it could be improved but I have not had enough need to bother.
If I get where you are heading with this question: you can create automations to do the setting changes you need, and then EDIT the Scheduler card, navigate to its ENTITIES tab, and enable those automations as entities that it can control. Then you can create schedules that run, enable, or disable those automations.
Of course you don’t necessarily need to use the Scheduler card at all; you could just create the automations you need and configure them to trigger on appointed times or whatever conditions, and then put them (automation.whatever) on an entities card where they will show up as a switch that allows users to enable or disable them, if that’s what you want to be able to do. Or add buttons to trigger an action to run them. No digging into Settings needed.