there is one simple way (well, simple might be too simple a word, but it's not too difficult either), if you're willing to toy with the "Show Package Content" function.If you go here, you'll see that
Garnet X posted a step-by-step recipe in January 2018 for all RPGM MV games (which Fall of Juliet happily is). See here:
https://f95zone.to/threads/ways-to-run-rpgm-games-on-mac.6056/#post-402335
Thing is, the link he gives at Step 1 for his game base is no longer valid, so you'll need to create your own game base; simply duplicate a working RPGM Mac game that you've enjoyed (rename the copy to something else, just to avoid mistakes, for example "RPGM Mac game base"); right-click (or CTRL-click) on the RPGM game base, and choose Show Package Content from the pop-up menu, and delete the app.nw folder.
Now, close this and save: this will be your game base for all future RPGM Windows games that you want to run on a Mac.
From there, follow the rest of the step-by-step recipe.
Hint: if you want to avoid creating a new game base every time, make sure you duplicate your game base before doing step 2