Parse a tables with unicode chars in variables from JSON with SAS BASE

I've faced with a problem on parsing JSON with unicode char in vars. So, I have the next JSON (example):

 {  
   "SASJSONExport":"1.0",
   "SASTableData+TEST":[  
      {  
         "\u041f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f":2,
         "\u0421\u0440\u0435\u0434\u043d\u0435\u0435":4,
         "\u0421\u0442\u0440\u043e\u043a\u0430":"\u0427\u0442\u043e\u002d\u0442\u043e\u0031"
      },
      {  
         "\u041f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f":2,
         "\u0421\u0440\u0435\u0434\u043d\u0435\u0435":2,
         "\u0421\u0442\u0440\u043e\u043a\u0430":"\u0427\u0442\u043e\u002d\u0442\u043e\u0032"
      },
      {  
         "\u041f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f":1,
         "\u0421\u0440\u0435\u0434\u043d\u0435\u0435":42,
         "\u0421\u0442\u0440\u043e\u043a\u0430":"\u0427\u0442\u043e\u002d\u0442\u043e\u0033"
      }
   ]
}

To parse the table from JSON I use SAS engine:

libname jsonfl JSON fileref=injson ;

The code higher decode chars in cells, but name of vars looks like missing vals:

+--------------+---------------------------+------------+---------+---------+
| ordinal_root | ordinal_SASTableData_TEST | __________ | _______ | ______  |
+--------------+---------------------------+------------+---------+---------+
|            1 |                         1 |          2 |       4 | Что-то1 |
|            1 |                         2 |          2 |       2 | Что-то2 |
|            1 |                         3 |          1 |      42 | Что-то3 |
+--------------+---------------------------+------------+---------+---------+

The header must look like:

+--------------+---------------------------+------------+---------+---------+
| ordinal_root | ordinal_SASTableData_TEST | Переменная | Среднее | Строка  |
+--------------+---------------------------+------------+---------+---------+

So I've decide to replace unicoded variables chars with names like this DIM_N_. And for that I must find all strings, that agree with next regexp: /([\s\w\d\\]+)\"\:/

But, to get strings from json I need set as delim the next char '{','}','[',']',','. But if set that chars as dlm , I willn't assemble json again. So I've decide to paste before the char ~ to set it as dlm.

data delim;
    infile injson lrecl=1073741823 nopad;
    file  delim;
    input char1 $char1. @@;
        if char1 in ('{','}','[',']',',') then
            put '7E'x;
        put char1 $CHAR1. @@;
run;

I've get the novalid json file:

~
{"SASJSONExport":"1.0"~
,"SASTableData+TEST":~
[  ~
{"\u0056\u0061\u0072":2~
,"\u006d\u0065\u0061\u006e":4~
,"\u004e\u0061\u006d\u0065":"\u0073\u006d\u0074\u0068\u0031"~
}~
,  ~
{"\u0056\u0061\u0072":2~
,"\u006d\u0065\u0061\u006e":2~
,"\u004e\u0061\u006d\u0065":"\u0073\u006d\u0074\u0068\u0032"~
}~
,  ~
{"\u0056\u0061\u0072":1~
,"\u006d\u0065\u0061\u006e":42~
,"\u004e\u0061\u006d\u0065":"\u0073\u006d\u0074\u0068\u0033"~
}  ~
]~
}   

So as the next step I'm parsing JSON and use ~ as the delimiter:

data transfer;
length column $2000;
retain r;
    infile delim  delimiter='7E'x nopad;
    input char1 : $4000. @@;
            r = prxparse('/([\s\w\d\\]+)\"\:/');
            pos = prxmatch(r,char1);
            column = prxposn(r,1,char1);
        n= _n_;
run;

It works... But I feel that those are too bad practices, and It has confines.

UPD1
Option,

options vAlidfmtname=long VALIDMEMNAME=extend VALIDVARNAME=any;

return:

+--------------+---------------------------+----------------------------+---------+--------------+
| ordinal_root | ordinal_SASTableData_TEST |         __________         | _______ |    ______    |
+--------------+---------------------------+----------------------------+---------+--------------+
|            1 |                         1 | авфа2 фвафв = фвыа - тфвыа |       4 | Что-то1 ,,,, |
|            1 |                         2 | авфа2 фвафв = фвыа - тфвыа |       2 | Что-то2      |
|            1 |                         3 | авфа2 фвафв = фвыа - тфвыа |    2017 | Что-то3      |
+--------------+---------------------------+----------------------------+---------+--------------+

So my questions are:

1. Can I decode the whole file without the infile statement?
2. Can I use infile delimiter, but set smth options to not delete the delimiter?

Adequate criticism is welcomed.