I was right. 
My 7* review in OEX is still blocked by OEX censors, and your stars are suppressed.
24hrs are promised for reviews in OEX.
If your speed is closer to light speed, time passes slower. (as by Albert E.)
Though I fail to detect any other trace of such speed 😁

Using methods inside the class instead of
The external MAC routine in the original code is an elegant and valid approach

Happy New Year!
Here is a draft version of ZPretty.mac for ISIS
I'm not sure if this is worth to be public at all.

ZPretty ; make JSON readable
#; input= JSON string 
Do(input) public {
    if $e(input)="{" do ##class(%JSON.Formatter).%New().Format(input)
    else  write "<UNDEFINED>"
    quit ""
    }
tst  public ; 
    set jsn={"Name":"Li,Robert K.","SSN":"672-92-9664","DOB":"1975-01-12","Home":{"Street":"986 Washington Blvd","City":"Boston","State":"PA","Zip":"95802"},"Office":{"Street":"6012 First Place","City":"Reston","State":"MT","Zip":"77739"},"Spouse":{"Name":"Avery,Zelda H.","SSN":"323-13-7437","DOB":"1943-03-27","Home":{"Street":"196 Main Drive","City":"Youngstown","State":"WY","Zip":"53229"},"Office":{"Street":"4056 Franklin Court","City":"Bensonhurst","State":"IA","Zip":"27688"},"FavoriteColors":["Black"],"Age":77},"Age":45,"Title":"Associate Marketing Manager","Salary":10421}
    quit jsn