Right now, the workload view only seems to take into account time estimates. When a task has tracked time, the workload view doesn't take this into account and won't shorten the time estimate of the task.
Clickup's Workload view also assumes that task time will be equally distributed per day. This is an issue for tasks that are worked on inconsistently. In some cases, I only have thirty minutes for a task one day and an hour for it the next day.
There isn't a good way to split up the time estimates in Workload view other than by artificially splitting the task into subtasks and tracking hours that way.