Hi, is there a way to encode a Flyte Serialized Object into json? Like the ones that represents WorkflowExecution inputs and outputs.

Yes

Could you send me the link to the function, is it included in

flytekit

?

maybe you can use: https://github.com/flyteorg/flytekit/blob/5dae5a7700e90a7101354538f148def21afc759f/flytekit/interaction/string_literals.py#L57