How to schedule C++20 coroutines with stdexec?

[DuKeM-CSGO]

afaik stdexec uses utils to make C++20 coroutines as senders, such as exec::task<void> and as_awaitable.
How can I schedule them generally?

auto background_task
 = schedule(sch)
 | let_value(
    []->exec::task<int> {
        co_await std::suspend_always{}; // suspend here
        co_return 42;
    }
 );

auto another_task
 = just()
 | then(background_task)
 | then(???) // Try to resume the coro here
 | then([](int i) { std::println(i); });