Is there a way to get the metrics results displayed on prefect cloud UI? I know there's an option of sending the metrics results( as an output of function) locally or S3, etc... but is there an option to redirect these results to immediately be displayed on the UI?

What do you mean by metrics in this context? I think what you try to achieve can be done using artifacts https://docs.prefect.io/orchestration/concepts/artifacts.html#ui this post shows an example as well https://www.prefect.io/blog/introducing-prefect-ml-orchestrate-a-distributed-hyperparameter-grid-search/