Raspberry PI 3 (bcm2710, aarch64_cortex-a53) is missing many packages

Many packages are missing from the aarch64_cortex-a53 repository in OpenWrt 19.07.7. For example openvpn-mbedtls/openvpn-openssl etc.
But in aarch64_generic there is.
Can I use the aarch64_generic repository in rpi3?
When I only edited /etc/opkg/distfeeds.conf, it didn't work. (has no valid architecture, ignoring.)