how to separate config the rotate log's permission?

DateFileAppender has a mode arg to config permission，but it's together config current log and  rotate logs. I want to know "how to only config the rotate log's permission"
```
-rw-r----- myLog.log
-rw-r----- myLog.2024-08-23.log
-rw-r----- myLog.2024-08-22.log
```
i want to 
```
-rw-r----- myLog.log
-r--r----- myLog.2024-08-23.log
-r--r----- myLog.2024-08-22.log
```