Any tipps how I can add a given amount of days to a given datetime profile attribute?

E.g.

profile.mydate + 100 days

Thursday, 11 November 2021 + 100 days = Saturday, 19 February 2022

I checked https://experienceleague.adobe.com/docs/journey-optimizer/using/personalization/functions/dates.html... but couldn't find a way to achieve this.

Thank you!