ASUS RT-AX88U Router

That's virtually impossible, it's an all Broadcom (BCM49408 SOC, BCM43684 WLAN) design, for which no wireless drivers exist.

If you're looking for 802.11ax devices with a reasonable expectation of future OpenWrt support, you should consider QCA-Atheros instead (partial ipq8074 SOC support has been mainline for around 2 years, ath11k wireless drivers will be part of kernel v5.6). That isn't a guarantee either, nor will they be supported immediately, but chances aren't too bad.

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