There is a way that you can do it totally within PhotoLab
(image taken from a dpreview article)
This is only a jpeg file, RAW would work better.
Start by reversing the three colours in the curves tool
Then use the white balance pipette on the unexposed border of the negative
This should give you a “near enough” neutral white balance. It works better with a RAW image
Then return to the curves tool and adjust the RGB curve to enhance the contrast
At this point, You can either continue with the original image (but be aware that a lot of the sliders now act in reverse) or export to DNG to get a “fresh start” with the now positive image.
It’s not perfect but it can be done with only PhotoLab and a bit of patience