Convert filter pipe to Angular computed signal

I use RxJS filter pipe to trigger data reload from the REST server only when selectedId is not null. How do I transfer the observable into signal/computed signal achieving same effect as with the filter pipe?

this.selectService.selectedId$.pipe(filter(selectedId=> selectedId!= null)).subscribe(
this.restService.loadData(...);
);


Ideally I would like the signal not to trigger when then value is null/undefined, cause then it would cause a data load for null id from the server.

Is this even possible to do with computed signals?

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