I assume that you're outside of US. Outside of professional FCC-licensed-per-AP equipment, no, you cannot. There is a reason why OpenWRT has a weird limitation

I assume that you're outside of US. Outside of professional FCC-licensed-per-AP equipment, no, you cannot. There is a reason why OpenWRT has a weird limitation on some routers where an EU model is perfectly okay while simultaneously not working with a US model.