Use LSTM as the feature extractor of financial data

Hello, I have LSTM as the feature extractor of financial data the problem. I also want to build an LSTM feature extractor on Sb3 for financial time series data, using mlppolicy strategy network. I want to ask whether fin-rl now has an LSTM algorithm feature extractor.
When looking up the problem #195 in finrl, I now use the Sb3 framework in finrl, and support LSTM as the feature extractor in SB1. How can I smoothly migrate back.
Thank you for your previous exploration.