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You need an OPENJSON() call with the appropriate path to access the nested $.source_info.help_info.details JSON array and STRING_AGG() to aggregate the names:

Sample data:

SELECT *
INTO Data
FROM (VALUES
   (1, 45745, '{"source":"XYZ",
     "source_info":{
         "type":"need_help",
         "help_info":{     
                "questions":50, 
                "details":[{"floatv":0.42,"name":"Tom"},{"floatv":1.08,"name":"Dick"},{"floatv":1.2,"name":"Harry"}]}}}')
) v (UID, ID, JSON)

Statement:

SELECT 
   ID, 
   NAMES = (
      SELECT STRING_AGG(JSON_VALUE([value], '$.name'), ' ') 
             WITHIN GROUP (ORDER BY CONVERT(int, [key]))
      FROM OPENJSON(JSON, '$.source_info.help_info.details')
   )
FROM Data