Based on install counts, overall reviews, and last updated dates, I've narrowed it down to two apps:
Always On Edge - Edge Lighting: https://play.google.com/store/apps/details?id=com.used.aoe
True Edge | Edge Lighting: https://play.google.com/store/apps/details?id=com.newgen.edgelighting
I guess I'll give both a whirl and report back with my impressions.
I like LG's version well enough, but more customization options is always OK in my book.
I tried both, and even paid the one-time IAPs to unlock all options for both apps.
Frankly, I don't like either. Unlike LG's built-in Sidelight, I couldn't get either of these two edge lighting apps to play nice with either the stock AOD (which I prefer to their clunky versions), my lockscreen live wallpaper, or both. On top of that, even after taking pictures of LG's blue Sidelight colors and using a color picker to determine their hex values and inputting them into those two replacement apps, I couldn't quite duplicate the neat glow LG's got going on. No amount of futzing about netted me results nearly as pretty as LG's Sidelight. And I tried every possible feature, slider, and toggle in both apps.
That, in combination with having to settle for jankier AODs that don't work with my preferred live wallpapers completely turned me off from both apps, and I wound up uninstalling them and sticking with LG's non-customizeable Sidelight feature. Oh well. Cost me a few buck and around 1.5 hours of tinkering, and it just wound up being a waste of time and money.
If I had to recommend one, I'd say that Always on Edge - Edge Lighting is the preferred app. It appears to have more customizations and options available than True Edge | Edge Lighting. That does mean that you'd need to tinker with the app more to get the results you want, but it does afford you a larger variety of customizations. FWIW, both let you mess around with notch presets and then further tweak height, width, and radius curves in order to get the edge lighting to properly wrap around the LG V60's cut-out. You can also simply ignore the notch options and have the wrap-around edge lighting "cut off" where the notch starts and resume where it ends, if you don't feel like messing with it that much. It can be a bit finicky. Again, I found that Always On Edge handles variable notch sizes better than True Edge.