10000 HTTP requests from browser

I have an app, where the home page shows a table(ag-grid) with 10k records.Now in some cases we need to update the all the records data with some value(NOT entered by user or edited with ag-grid), just some value at backend. so for this my BE team is not providing any update API which can take IDs of all records and update them at backend rather they are asking to make 10k http calls to update records individually.

What is the alternative to this?? Also I want to know what will happen at UI if I do this.