AttachAction custom select option labels

Hi! I have an

AttachAction

AttachAction

to attach records with pivot attributes, so I am using the the

form()

form()

method to return

$action->getRecordSelect()

$action->getRecordSelect()

together with other inputs. I am trying to concatenate

getOptionLabelFromRecordUsing($closure)

getOptionLabelFromRecordUsing($closure)

in order to customise how the select option labels appear but

$closure

$closure

is not getting called... is there a way to achieve this? Thanks!