I would like to visualize the workload (sum of the hours assigned to the tasks for the specific date) in order to plan more efficiently day, week and year. Is there anything like that already made?
You will need a dates database in your Notion workspace for this to work, because you want to calculate by day.
Create a database with the 365 days of the year, relate that to your tasks and rollup the numbers as sum, that way you can go to any day of the year and see the numbers.
Perfect timing before starting 2023.