previous iteration in foreach

This will fulfil your requirement if I understood your query correctly

a!localVariables(
  local!data: {
    a!map(
      name: "aaaaa",
      valor: 1
    ),
    a!map(
      name: "bbbbb",
      valor: 10
    ),
    a!map(
      name: "ccccc",
      valor: 10
    ),
    a!map(
      name: "ddddd",
      valor: 10
    ),
    a!map(
      name: "eeeee",
      valor: 45
    )
  },
  local!uniqueValors: union(local!data.valor, tointeger({})),
  local!valorIndices: createdictionary(
    local!uniqueValors,
    enumerate(length(local!uniqueValors))+1
  ),
  a!forEach(
    items: local!data,
    expression: a!map(
      name: fv!item.name,
      pos: property(local!valorIndices, tostring(fv!item.valor), null)
    )
  )
)

The problem with that, and please correct me if I'm wrong, is that it will only work if the 'valor' values are ordered.
In adition, never seen a 'Bean' Appian type as shown in the property function that you are using!!!!!!!!

yes for this the values should be ordered

to use Aryan code, add this as a new variable right after local!data, and use that new variable:

todatasubset(
  arrayToPage: local!data,
  pagingConfiguration: a!pagingInfo(
    startIndex: 1,
    batchSize: -1,
    sort: a!sortInfo(
      field: "valor",
      ascending: true
    )
  )
)

if you see name in the code snippet refresh, edited to "valor".

if you see name in the code snippet refresh, edited to "valor".