At least 117 publications in @joss mentioning the string "National Science Foundation"
...now obviously there's a bit of further work to do, to distinguish between the Swiss National Science Foundation and the U.S National Science Foundation and the National Science Foundation of Sri Lanka but it's clear to me that there's a lot of funded research in JOSS.
am planning to demonstrate just how much funded research is in JOSS, in order to demonstrate to funders just how much research they themselves have funded(!), that would be ignored if they just used Web of Science, or Scopus to evaluate the research they fund!!!