Your formula for the baseline forecast is correct. If you want to show for two years, make sure to set either the past years or future years to 1 as per your requirement in the Time setting(Modal calendar). Since I want the year 2020 and 2021 in my model, I have set the future year to 1.
In the Blueprint view, set the Time scale to Week.
Select both the baseline forecast and Initial demand forecast and choose the chart type you want.