well, the ICU units are the main problem here. I guess other countries would choose to upgrade existing rooms here. And a 1000 beds in rooms with drywall separation - we did this in Germany for the refugees and (maybe contrary to China) we have a relative abundance of existing superstructures (communal gyms, old military sites)...
We also have tons of old, maybe obsolete I don't knw, military and emergency stuff sitting in warehouses for things like that from the cold war. My impression is that all measures currently being taken are there make sure we don't need to go to these extremes.