How much is bubble in dollars?

I'm just curious, how exactly can we quantify the size of a bubble in the cryptocurrency market in dollars? It's a notoriously volatile asset class, so I'm not sure how to approach this question. Is there a specific metric or formula that economists use to estimate the dollar value of a bubble? Or is it more of a subjective assessment based on market sentiment and other factors? I'd really appreciate it if you could shed some light on this matter for me.