Adding Unique Identifiers to Spans for SpanQuery Usage

Hi What is the best way to add a unique identifier to a span? I need this in order to query a unique span using SpanQuery. Would this be the way? Is there a better way?

@using_metadata({"conversation_id": uuid.uuid4()})
@tracer.tool()
def my_function()

And then query with:

uery = SpanQuery().where(
    "metadata["conversation_id"] == 'cd273007-cd71-4c49-b7....'"
)