Currently gitlab cli supports 'project get' by project id only, while Gitlab API supports getting specific project also by namespace/project_name

"Get a specific project, identified by project ID or NAMESPACE/PROJECT_NAME, which is owned by the authenticated user. If using namespaced projects call make sure that the NAMESPACE/PROJECT_NAME is URL-encoded, eg. /api/v3/projects/diaspora%2Fdiaspora (where / is represented by %2F)."

In this way user can get project ID knowing only it's name and reuse this ID later (to add milestone or issue etc.)

Currently I have to store project ID's somewhere to use them with CLI.

I could also try to use "project search" or parse output from "project list" command but it's overcomplicated.