Android (Java/Kotlin) Google Sheets API: Hide Columns

val service = ...val spreadsheetId = ...val sheetId = 0val requests = listOf<Request>(    // Hide G, H, I    Request().setUpdateDimensionProperties(        UpdateDimensionPropertiesRequest().apply {            range = DimensionRange().apply {                this.sheetId = sheetId                dimension = "COLUMNS"                startIndex = colToIndex('G')                endIndex = colToIndex('G') + 3            }            properties = DimensionProperties().apply {                hiddenByUser = true            }            fields = "hiddenByUser"        }    )}val body = BatchUpdateSpreadsheetRequest().setRequests(requests)service.spreadsheets().batchUpdate(spreadsheetId, body).execute()

fun colToIndex(char: Char): Int {    return char.toInt() - 65}