A means to extend the life of transient activation

[marcoscaceres]

Consider the following case, which developers appear to be running into:

<button>Share it!</button
<script>
button.onclick = () => {
    // Slow network + really big file
    const image = await fetch("really-big-file").then(doMoreSlowStuff);
    
    // Oh no!!! transient activation expired! 😢
    navigator.share({files: [image]});
} 
</script>

What would be nice there was some way to extend the life of transient activation above...