Variable-width fonts aren’t ideal for animation. Don't give up on your favourite font just because it looks ugly animated, use Monospacer. It works by taking your original text layer and simply shifting the characters to ensure even spacing.

Compatible with both horizontal and vertical text.

Comparing variable width-font on the left to the same font using Monospacer on the right.

Home page - https://aescripts.com/monospacer/