Can I persist arbitrary values relevant to a project?

[ViktorSafar]

Is there a way to store arbitrary (string) values into a Pro Project? A key-vaklue pair similar to a web session or Redis database or a persisted dictionary. 

In my case, at the beginning of their worfklow, the user choses to work in an area represented by a polygon feature. I would like to store a reference to the chosen area and go directly to it next time the user opens the project.

[GKmieliauskas · Accepted solution]

Look at the Esri ArcGIS Pro SDK community sample BackStage_PropertyPage.

It shows how to store project or application settings and read them on project open event.