how to use group: sum in lines

[del-d-w]

total_admin_fee:
parser: lines
start: Total Claims\s+Admin Fee
end: Totals
line:
- $(?P[\d,]+.\d{2})\s+$(?P[\d,]+.\d{2})\s+$(?P[\d,]+.\d{2})
types:
standard: float
connect: float
other: float
group: sum

with this sum ( standard+ connect+ other ) is not coming

currently getting this  

'total_admin_fee': [ { 'connect': 0.0,
                     'other': 0.0,
                     'standard': 10.0},
                   { 'connect': 0.0,
                     'other': 0.0,
                     'standard': 20.0}]

but i want 'total_admin_fee': 30.0