support for rewriteRule in cookie flag

Question

I'd like to use $1 in the [cookie] flag of RewriteRule. I want to create a cookie with a part of the request URL as in the following:

RewriteRule ([0-9]*)/*. - [CO=cookieName:$1:example.com]

for example: If the request url is: http://www.example.com/1234, i want to set a cookie name cookieName with the value 1234

it seems no cookie is add when a dollar sign ($1) is between the cookie directive.

Is this something possible ?

Thank you