Please check ISO 14001:2015 clause 0.5 where you can read “This Standard does not contain requirements specific to other management systems, such as those relating to quality, health and safety at work, energy or financial management”.
Your question made me remember my ISO 14001:1996 Lead Auditor training. The trainer said something like: “people may be dying inside the organization, as long as there is no impact in the environment is outside the scope of ISO 14001. If you open a very small door, sooner or later you will be having a safety audit in the middle of what is supposed to be only an environmental management system audit. Perhaps this article could be useful - ISO 45001 vs. ISO 14001: Differences and similarities - https://advisera.com/45001academy/blog/2019/02/20/iso-45001-vs-iso-14001-differences-and-similarities/