I don’t think you’ll be able to do this with the built in sliders and animation frames. You could take a look at using FigureWidget+ipywidgets if you’re working in the Jupyter Notebook (See “Context Manager for Animations” section at 🌟 Introducing plotly.py 3.0.0 🌟 | by Plotly | Plotly | Medium) or Dash if you want a stand alone web app (See 📣 Exploring a "Transitions" API for dcc.Graph for initial work on adding animated transitions to Dash).
-Jon