@LJacobsen If i understand you correctly, you have manually created objects (in your case a DLT pipeline) that you now want to manage in your asset bundle. If that's the case "bundle deployment bind" is your friend:
https://learn.microsoft.com/en-us/azure/databricks/dev-tools/cli/bundle-commands#bind

With this command you can also bind other pre-existing objects like schemas, volumes, jobs, etc.