Root Huawei Honor 9 Lite without screen access
In short - No, there isn't  

Assuming you have previously unlocked bootloader (with unlock code from Huawei, which they don't provide anymore), there is still the encryption problem.  

But your bootloader is locked, that means there is no hack into data partition.  

In case you get TWRP booting from fastboot (which you don't), you could root /system and enable USB-debugging from TWRP, then remote control the device with scrcpy