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This new option is available under the Autofill menu for a column. Selecting it allows users to create a new QGIS expression to use to update the value inside that column. Existing parameter values (including those from other columns) are available for use inside the expression via @variables. E.g. this allows setting output file names to complex expressions like '/home/me/stuff/buffer_' || left(@input, 30) || '_' || @distance || '.shp'