preseeding in auto mode URL syntax without hardcoding directory of release name

[john doe <johndoe65534@mail.com>]

At [1, B.2.3] says that if an URL has no slash in it 
"d-i/trixie/./preseed.cfg" the default path will be used.

Is there a way to have that same path for an other file than preseed.cfg 
(E.G: "url=example.com/alternative.cfg" would translate to 
"d-i/bookworm|trixie/./alternative.cfg")?

I would like to preseed installations for Bookworm and Trixie without 
having to fully qualify the URL with the exception of a cfg file name.

I appreciate any input.


[1] https://www.debian.org/releases/stable/amd64/apbs02.en.html

--
John Doe