How to add a Span Link to a Span previously created by auto-instrumentation?

[philsttr]

I have a situation where I want to add a Span Link to a Span that was previously created via auto-instrumentation. Since I can't modify the auto-instrumentation code to add the Span Link when it creates the Span, I would like to add the Span Link later after it is created. Is this possible somehow?

From what I can tell, Span Links can only be added via the SpanBuilder used to create the Span, and can't be added to the Span later, but I might be missing something.

[trask]

related to open-telemetry/opentelemetry-specification#3678