HOW TO RETRAIN BEST MODEL ON FULL DATA AFTER TEST SCORE

Dear,
in TimeSeries FLAML module examples You kindly show how to use flaml and in the example is also used a test set data (the last part of all data, generally);
after the flaml model end to search the best model You show how to score the test set data using the best model.
Your examples end.
I THINK that is missing a phase: retrain the best model on the full, repeat full data.
I tried but i fail.
Please could you kindly reply :
1) if my idea is right
2) how to retrain the best model on the full, full data (with the hyperparameters founded)

thank in advance and waiting your kindly reply.

Luigif2000