Not sure of your status, but there is a BA lounge that's accessible to OW Emerald and Sapphire, as well as an Aspire Lounge. Also says, "Access for eligible customers traveling on any oneworld member airline", which is a little ambiguous but you can probably get into at least one of them.

Other lounges can be found here: https://www.amsterdamtips.com/schiphol-airport-lounges