Alter a specific row in tableRepeat

In essence I’m looking for way to check a checkbox in a specific row of a tableRepeat. I’ll describe it more precisely with a screenshot.

Adnotacja 2020-04-21 111851611×657 26.8 KB

1. user inputs a value in the field
2. if that value matches the one in the row the checkbox will be checked.
   (it then sends an update action to the server)

desired effect:

I know I could do a similar thing with a server action but I’d rather avoid constant data source refresh.

With a simple javascript I am able to get the index of the row with the matching value but I’m stuck on that as I don’t know how to reference that particular row (flow doesn’t seem to have an action like that).