Use customPickerField with googleMaps

Hello, I am trying to implement a custompickerField, but I still don't understand very well how the suggestFunction and selectedLabels work since I have my DP_addressSugestion rule that receives the address and through the Google Maps API it already returns the filtering. Here is my suggestFunction.

a!localVariables(
  local!addressSugestion: rule!DP_AddressGoogleMaps(
    address: ri!address,
    latitud: -9.5,
    longitud: -75
  ),

  if(
    local!addressSugestion.success,
    a!localVariables(
      local!labels: a!forEach(
        items: local!addressSugestion.result.places,
        expression: index(fv!item, "description", null)
      ),
      local!values: a!forEach(
        items: local!addressSugestion.result.places,
        expression: index(fv!item, "description", null)
      ),

      a!dataSubset(
        data: local!labels,
        identifiers: local!values,
      )
    ),
    a!dataSubset(
      data: {},
      identifiers: {},
      totalCount: 0
    )
  )
)

Please help me to understand or some advices to work it