Are custom grid breakpoints possible yet?

I´m kinda lost with this, I have been reading that it isnt possible but it still appears in the docs:

Open with chrome if possible:,grid%2Dwidth%2Dxl%3A%201140px%3B

If it is possible where could i apply that --ion-grid-width-lg on scss? on the ion-grid element itself?

If it isn´t possible why is it on the docs? it doesn’t make that much sense

I dont have a problem using a media query myself, but seeing it on the docs made me want to do it that way, thanks in advance!!