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RUNTIME_PREFIX references in gitconfig variable paths

One thing I wanted to do was provide a default ca-bundle.crt file along
with my local build of Git.  I need my installation to be relocatable
and I'm using RUNTIME_PREFIX with Git 2.18.0 (on GNU/Linux).

I can provide a system gitconfig file with a setting for http.sslCAInfo
but the problem is I can't create a relocatable path here so I don't
know how to set it:

  $ cat $prefix/etc/gitconfig
      sslCAInfo = <prefix>/etc/ca-bundle.crt

What do I use for <prefix> above since I want it to be relocatable? 
Basically I want this to be in the same directory as the relocatable
sysconfdir (I don't actually care much but that seems like a good

Is there some way to create a reference to a path relative to the
installation directory?

For example "~" is accepted as the users $HOME path; is there some
syntax which refers to the Git installation directory?

If not this seems like something that would be very useful.

I can use a wrapper script and set GIT_SSL_CAINFO, but that will also
override any user's setting of http.sslCAInfo in their local gitconfig
which I don't really want.