Can MoKee 8.1.0 (A6020) be installed over LineageOS 15.1 without wiping data?

Can MoKee 8.1.0 (A6020) be installed over LineageOS 15.1 without wiping data?
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I have some important data on my Lenovo Vibe K5 and I don’t afford to lose them. How can I move to MoKee without losing the app data? Backups are also an option, but I don’t know how I could make a full backup of the apps, including WhatsApp accounts (e.g), messages and so on. Basically all the data one app could create.

Any help?

It is NOT recommended to install another custom roms without wiping data. You can use some tools to make a backup of your application data, such as Titanium Backup.

Well, from what I tested lately, Titanium Backup won’t backup the full data of the apps. Someone suggested I do a Nandroid backup of the data. I will definitely do that. But a Titanium Backup that includes the app data will definitely be better.