Thanks for following up and sending that information!
In your Model, in the "Summarized Infrastructure" view I can see the Hosted Zones > ALB and Hosted Zones > NLB lines (both located in the "dm-labs-vcp"). In the "Infrastructure" view you can see that "dev-labs" is the hosted zone with these connections. I am not able to see lines from NLB > ALB or from ALB > NLB in another VPC as described by you. Checking the list of supported lines it looks like ALB <> NLB lines are not yet supported, so this explains why they are not appearing in your Model.
We’re very interested in your feedback and committed to continually improving our products. Please first search the Product Feedback section of this community (with the filter Topic Type = Idea) to see if it’s already been submitted. If so, please add any additional details you’d like and upvote the request - this consolidation helps to refine feedback and properly capture the popularity of the request.
If no one has submitted adding these lines as an idea yet, please create one of your own and be sure to include details about your use case or what you’d like to see in this experience. This will also allow other users with similar requests to discover and upvote it, then add details of their own.
Finally, for more information on how Lucid manages feedback via this community, take a look at this post:
https://community.lucid.co/welcome-to-the-lucid-community-15/feedback-and-feature-requests-5439