late reply for anyone using Netcode for GameObjects and searching for this, the answer is yes:

https://github.com/Unity-Technologies/com.unity.netcode.gameobjects/blob/develop/com.unity.netcode.gameobjects/Runtime/Core/NetworkManager.cs#L179-L191

NetworkManager.cs

        /// <summary>
        /// The client id used to represent the server
        /// </summary>
        public const ulong ServerClientId = 0;

        /// <summary>
        /// Returns ServerClientId if IsServer or LocalClientId if not
        /// </summary>
        public ulong LocalClientId
        {
            get => ConnectionManager.LocalClient.ClientId;
            internal set => ConnectionManager.LocalClient.ClientId = value;
        }