Android (Java/Kotlin) Google Sheets API: Protect Column/Cell From Edit

val service = ...val spreadsheetId = ...val sheetId = 0val spreadsheet = service.spreadsheets().get(spreadsheetId).execute()val sheet = spreadsheet.sheets.find { sheet ->    sheet.properties.sheetId == sheetId}// check if protected range already existval protectedRangeDescription = "ID Protect"val protectedRange = sheet?.protectedRanges?.find {    it.description == protectedRangeDescription}if (protectedRange == null) {    val requests = listOf<Request>(        // protect column A from edit with warning        Request().setAddProtectedRange(            AddProtectedRangeRequest().apply {                this.protectedRange = ProtectedRange().apply {                    range = GridRange().apply {                        this.sheetId = sheetId                        startColumnIndex = colToIndex('A')                        endColumnIndex = colToIndex('A') + 1                    }                    description = protectedRangeDescription                    warningOnly = true                }            }        )    )    val body = BatchUpdateSpreadsheetRequest()    .setRequests(requests)    service.spreadsheets().batchUpdate(spreadsheetId, body).execute()}

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