Hi Kandur!
Yes there is. Example:

...
(git-reference (url ...) (commit ...) (recursive? #t))
...

Best regards
David

On Thu, Dec 2 2021 at 08:12:35 +0100, Adam Kandur via Development of 
GNU Guix and the GNU System distribution. <guix-devel@gnu.org> wrote:
> Hi guix!
> Is there way to clone a project when i'm building a package with all 
> git submodules?