TJson.JsonToObject<TProcessTextImageResult>(MemoContent.Lines.Text);

    TProcessTextImageResult = class
    private
       FSuspiciousSymbolsCount: Integer;
        FUnrecognizedSymbolsCount: Integer;
        FAllSymbolsCount: Integer;
        FAllWordsCount: Integer;
        FNotDictionaryWordsCount: Integer;
        FResult: TBytes;
    published
        property SuspiciousSymbolsCount: Integer read FSuspiciousSymbolsCount write FSuspiciousSymbolsCount;
        property UnrecognizedSymbolsCount: Integer read FUnrecognizedSymbolsCount write FUnrecognizedSymbolsCount;
        property AllSymbolsCount: Integer read FAllSymbolsCount write FAllSymbolsCount;
        property AllWordsCount: Integer read FAllWordsCount write FAllWordsCount;
        property NotDictionaryWordsCount: Integer read FNotDictionaryWordsCount write FNotDictionaryWordsCount;
        property Result: TBytes read FResult write FResult;
     end;