Function

There is no direct function. You can use todatasubset() paired with sortInfo() to get the desired result.

a!localVariables(
  local!array: a!forEach(
    items: ri!array,
    expression: { utls: fv!item }
  ),
  todatasubset(
    arrayToPage: local!array,
    pagingConfiguration: a!pagingInfo(
      startIndex: 1,
      batchSize: - 1,
      sort: a!sortInfo(field: "utls", ascending: ri!isAscending)
    )
  ).data.utls
)

You can also use Sort Utilities plugin, only if you are okay with dependency on a custom plugin.

However, I believe it is high time Appian should introduce OOTB documented version of the hidden sort() function, instead of forcing us to first convert the data into key value pairs and then use todatasubset and pagingInfo just to apply sorting to a list of numbers.

Hidden sort() function: