Yes, I am able to pull packages when installing.

root@GL-MT2500:~# cat /etc/opkg.conf
dest root / dest ram /tmp lists_dir ext /var/opkg-lists option overlay_root /overlay

root@GL-MT2500:~# cat /etc/opkg/customfeeds.conf
`(comment) add your custom package feeds here

(comment) src/gz example_feed_name http://www.example.com/path/to/files`

root@GL-MT2500:~# cat /etc/opkg/distfeeds.conf
src/gz glinet_kmod https://fw.gl-inet.com/releases/v21.02.3/kmod-4.2.1/aarch64_cortex-a53/mediatek/mt7981 src/gz glinet_gli_pub https://fw.gl-inet.com/releases/v21.02.3/packages-4.0/aarch64_cortex-a53/glinet src/gz glinet_gli_packages https://fw.gl-inet.com/releases/v21.02.3/packages-4.0/aarch64_cortex-a53/packages

`