From the article:

According to the bill, also called  H. R. 550, the government would provide $400 million in taxpayer dollars to fund “immunization system data modernization and expansion,” a system otherwise defined as “a confidential, population-based, computerized database that records immunization doses administered by any health care provider to persons within the geographic area covered by that database.”

H.R.550 - Immunization Infrastructure Modernization Act of 2021:

https://www.congress.gov/bill/117th-congress/house-bill/550