What do you mean by "port"?
TWRP is supported on multiple A/B devices such as the Google Pixel. However, TWRP does not support the compression necessary to replace the stock recovery in the boot image, so TWRP may only be used "live", where the TWRP image is booted via command, instead of being flashed to /boot.
By porting I mean changing some files, like copying the kernel and other device specific files to a prebuilt TWRP boot image for a related device.
For example I was able to do that for my android 8 based device and it worked flawlessly, but my problem is that I don't know how to do that for a/b partitioned devices cause my device is not officially supported and i can't seem to find any unofficial version for my device, plus my phone's kernel source and device are not published on GitHub or anywhere.
But some devices specially some Mediatek and Unisoc based devices don't support live boot and so it's necessary two flash it to the boot partition.
Finally built twrp for this device after so many attempts, here is the file for those that owns this device too.
NOTE: This file is for KG5j variant not KG5k or any other variant