Is it possible to set a span start and end time in seperate requests in OpenTelemetry - azure-logic-apps

Question

Im trying to introduce tracing to workflows we have in azure logic apps. I was hoping to start a span as the first step in a logic app via a request to a function app that would return the traceid and spanid that could be past into further nested steps for tracing.
This works only if I end the span and submit it which leads to a trace that looks like this.
Ideally I would like to make an update to the span to change the endtime and attached other information at the end. None of the Apis I see let this happen so Im assuming its a no no and against spec. Im wondering if anyone has run into situations like this and has any ideas.
The only thing I can think of is a stateful system like a durable function that doesn't submit any of the spans until they are all complete.
Perhaps my implementation is just wrong so here is the simple function app.
public static class JaegerHelper
{
[Function("JaegerHelper")]
public static HttpResponseData Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post")]
HttpRequestData req
)
{
var v = SendTrace(null, "JaegerHelper", 1.ToString());
SendTrace(v.Id, "JaegerHelper", 2.ToString());
SendTrace(v.Id, "JaegerHelper", 3.ToString());
SendTrace(v.Id, "JaegerHelper", 4.ToString());
var b = SendTrace(v.Id, "JaegerHelper", 5.ToString());
SendTrace(b.Id, "JaegerHelper", 6.ToString());
SendTrace(b.Id, "JaegerHelper", 7.ToString());
SendTrace(b.Id, "JaegerHelper", 8.ToString());
SendTrace(b.Id, "JaegerHelper", 9.ToString());
SendTrace(v.Id, "JaegerHelper", 10.ToString());
SendTrace(v.Id, "JaegerHelper", 11.ToString());
var response = req.CreateResponse(HttpStatusCode.OK);
return response;
}
private static Activity SendTrace(
string parentId = null,
string source = "DefaultSource",
string activityName = "DefaultActivity"
)
{
using var tracerProvider = Sdk.CreateTracerProviderBuilder()
.SetSampler(new AlwaysOnSampler())
.AddSource(source)
.AddZipkinExporter(config =>
{
config.Endpoint = new Uri("http://127.0.0.1:10003/api/v2/spans");
})
.Build();
using var activitySource = new ActivitySource(source);
var activity = activitySource.CreateActivity(activityName, ActivityKind.Server, parentId = parentId);
activity.Start();
activity.Stop();
tracerProvider.ForceFlush();
return activity;
}
}