How to access docker hostname from a service task

Docker Engine Swarm
5

I tried this, but i wonder its not recognizing {{.Node.ID}} in the below command and xxenv_var is always null

docker service create --name xxservice -e xxenv_var=$(docker node ls|grep {{.Node.ID}}|awk ‘{print $2}’)

xxenv_var={{.Node.ID}} works perfectly, but having {{.Node.ID}} inside the command is not working.

Thanks.