How to transfer ownership of a website

I am working for an agency, that creates websites for companies.
For our latest work we used Matomo as an Analytics Tool.

However, to get everything up and running, we first started out by using an internal account from our company to track the website data.

Now, we have to transfer the ownership of the project to our client.
I could not find any way to do that? Is there a way to change the ownership of a project or to transfer the data of a previous project to a new account?

Thanks a lot for any help or suggestions!

Hi @carolinmay
Is it Matomo Cloud, or on premise?
Do you want to transfer historical data or just the tracking (and new data only)?