
There is one for the Oneplus 7t and 7t pro aswell, you can check it out Here
Must have Magisk Installed
Installation:
Flash .zip via Magisk v17.0+ (Open Magisk>Select Modules from the Side Panel> Press the + button>choose the zip that you downloaded)
If you want to return to stock boot animation, disable/ remove module via magisk and reboot

Downloads:
Oneplus 7: Link
Oneplus 7 pro: Link
Preview:
Troubleshoot:

- If you do not see the bootanimation or you see the stock boot animation, check if you have any other magisk bootanimations actiavated?
If you do, disable them all, reboot, and reflash.
- If that does not work work:

If you end up using this method, remember to back up stock bootanimation by adding a .bak at the end of the file name.