I presume teachers in the US typically range in age from 24 to 65.
Adults 65 and older account for 16% of the US population but 80% of COVID-19 deaths in the US, somewhat higher than their share of deaths from all causes (75%) over the same period.
Rounding up, we have 200,000 COVID related deaths to date, so 20%, or 40,000, are of teaching age (presuming no deaths under 24, which is not true, but I'm rounding. That is of a total population under 65 of 275 million people, total.
There are 3.2 million public school teachers in the US, or 1.16% of the population under 65. So, we'd expect under 500 to die of COVID overall without any additional exposure due to school activities.
So, if 500 die without school, we might expect the figure to "double??" with school? Is school more prone to exposures than "normal life"? I think "it depends" obviously.
No doubt we will hear stories of this or that teacher dying of COVID, we already have, but the figures overall likely will be relatively small because of the statistics. We'd really need to know how many ELEVATED deaths are in that group, which could be rough to calculate because the numbers overall are small.