Yes, as with any research study, a protocol is the first step.
A protocol for any type of evidence synthesis review is a road map for your project and your research team members. It can be registered to let other researchers know that you are working on a specific project so they do not duplicate your efforts.
Protocol registration is highly recommended to avoid research waste. Protocols can be published as a separate article in many journals that publish systematic reviews. They can also be submitted to registries such as PROSPERO or the Open Science Framework so they are easily found by other researchers.