Get values from nested loop

Hi,

I have 2 arrays:

local!years: {"2019", "2019", "2018", "2017"}

local!income: {1,2,3,4}

So the value in "income" is corresponding to its year in the "years".

and I want to get this data like : "year" - sum("income")

2019 - 3

2018 - 3

2017 - 4

And I am trying to loop

local!yearsUnion: union(local!years,local!years),

local!res: a!forEach(
items:local!yearsUnion,
expression: with(
local!year: fv!item,
local!impact,
a!forEach(
items: local!years,
expression:
with(
local!val: 0,

if(
local!year == fv!item,
local!val = local!val + local!income[fv!index],
local!val = local!val + 0
)
)

)
)
)

But I am not getting what I want. I can find how I can return the value from the nested loop, so to connect it with the value of the parent loop

Any suggestions?