I wonder how long it will be, if ever, until we’ll have a self service site for GDPR that shows all holders of data with the ability for the user to retrieve an

I wonder how long it will be, if ever, until we’ll have a self service site for GDPR that shows all holders of data with the ability for the user to retrieve and/or delete their data? It would also be interesting if EU could provide some kind of register with API that all online actors in the EU has to report data collection to. I’m pretty sure regulating systems like these will become standard eventually, as users are more and more aware of the crazy situation.