Here is a simple guide how to colour correct and create your own LUT cubic in Premiere Pro. Relay simple https://youtu.be/fgiYDLeYlhw
5 min work and my OSMO+ footage was 100% better looking ;)
If you want to have a more advanced colour correction in the LUT here is a guide for that. https://youtu.be/wMKq8DWxiGs