This project contains a few Sequences I used, to test skeletal animation in Sequences.
You should know that Sequences were not made for this purpose. They're supposed to be used for cutscenes, animations, and UI, not as a replacement for sprites or Spine.
Even these Sequences can't be used with objects (as a replacement for sprites). But if you want to do skeletal animation for cutscenes, then you could surely use Sequences for basic animations.
Sprites used: https://opengameart.org/content/fantasy-heroes-editor-preview