How to install Transmission or Aria2 for Raspberry Pi 4B OpenWrt

I installed OpenWrt (LEDE) on the Raspberry Pi 4B, the BT download tool is not installed by default.

opkg update
opkg install transmission-daemon-openssl
opkg install aria2

But it shows :

Unknown package 'transmission-daemon-openssl'.
Collected errors:
 * opkg_install_cmd: Cannot install package transmission-daemon-openssl.

Unknown package 'aria2'.
Collected errors:
 * opkg_install_cmd: Cannot install package aria2.

I used the command opkg list | grep "transmission" to view the software list and found that

root@OpenWrt:~# opkg list |grep "transmission"
Package transmission-cli version 3.00-12 has no valid architecture, ignoring.
Package transmission-daemon version 3.00-12 has no valid architecture, ignoring.
Package transmission-remote version 3.00-12 has no valid architecture, ignoring.

I confirmed that the configuration in /etc/opkg/distfeeds.conf uses aarch64_generic，So is there no Transmission or Aria2 for the aarch64?