Several publishers (Wiley, Elsevier, Hindawi, more are listed here) allow you to attach your manuscript to your ORCID ID. Like other metadata, this ID is entered in a form at the submission stage, it is not part of the LaTeX code (which in most cases is converted to XML right away). The typical workflow is explained here.

So I would say the answer to your first question is that form-based entry is the accepted way to tell a publisher about your ORCID ID, and the answer to your second question is "no".

Several publishers (Wiley, Elsevier, Hindawi, more are listed here) allow you to attach your manuscript to your ORCID ID. Like other metadata, this ID is entered in a form at the submission stage, it is not part of the LaTeX code (which in most cases is converted to XML right away). The typical workflow is explained here.

If your manuscript is in MS Word, you can include the ORCID ID in the author list and the conversion to XML will pick it up (as explained here). I am not aware of a LaTeX implementation with the same functionality.

So I would say the answer to your first question is that form-based entry is presently the accepted way to tell a publisher about your ORCID ID, and the answer to your second question is "no".