Now since you all asked me how this is my way of making lineart gifs. It may be a tedious process but I hope you all stick with me to the very end.
STEP 1
Load your frames that you want to lineart in PS, make sure you delete any double frames to keep the process easier.

STEP 2
Create a new layer above the first frame

STEP 3
Using whatever tool you are comfortable with slowly take your time and draw over the lines using black paint or any colour you want

STEP 4
Do this to every line and every frame creating a new layer for each frame.

FINAL STEP
Now just convert the whole thing into a smart object and make it like a regular gif.

Remember you can use different colours just like I did in this gif to make it better
Thank you for reading I hope you all learned something very important from this tutorial. I hope to see many more lineart gifs in the future 🙂