Persist data via relationship manager Create & Create Again

On a normal page form I can persist data for auto-filling in repetitive fields by flashing the session on save like:
    public function createAnother(): void
    {
        session()->flash('dataFill', $this->data);
        parent::createAnother();
    }

Now I need to do this with the Relationship Manager. When attaching records how can I access the save and save another action to flash the session?
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