Change the namespace later to create an abstract store

[Jupdi]

Hi,
I want to implement an abstract store because we have some stores that have actions and properties in common though our app.
Therefore i created an abstract store class that has all properties and actions that are the same between all classes. Now I extend this class by the stores.
But now i cannot extend my store implementations by the VuexModule class an therefore i cannot define the namespace.
Is it possible to define the vuex module directly I my main store.ts where I normally would use extractVuexModule?

I can change some properties but not the internal path:
const filterStoreModule = (extractVuexModule(FilterStore))
filterStoreModule.prototype.namespaced = true
Thanks