For systematic reviews there are one of two ways that I'm aware of: PROSPERO [1] and Cochrane[2]. Cochrane is slightly more rigorous for conducting a review of this type. Although you do declare what meta-analyses you intend to do, you can't be overly explicit as it is largely dependent on the number of studies that are returned in your search strategy. For example two studies is too small for a meta-analysis so you would do a narrative review (discuss what you found).

[1]https://www.crd.york.ac.uk/prospero/

[2]https://www.cochranelibrary.com