How to include new TYPO3 Site Configuration feature?

[pixelbreit]

Hi, the Sitepackage-Builder is a great piece of work and makes creating new Sitepackage really easy.

But i can not figure out how i can include the new Site Configuration (/sites/sitepackagename/config.yaml) of TYPO3 9.5 in my own created package.
It should be installed together with my Sitepackage.

Is this possible at all?
I hope somebody can help me with that.

[koehnlein]

As mentioned in https://forge.typo3.org/issues/86803 you can inclue yaml files in other yaml files. This is not exactly what you have been looking for, but maybe it helps?