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You can use the Choices
function within PowerApps to get the label for a single-choice column.
LookUp(Choices('YourSPListName'.'YourSingleChoiceColumnName'), Value = YourSingleChoiceColumn)
Replace 'YourSPListName' and 'YourSingleChoiceColumnName' with the actual names in your PowerApps. This should give you the label for the single-choice column.