The only possibility (and I'm not sure that it is a possibility) is if your TV has an Ethernet port and you can connect it to your router. Then the app may find it. If there's no Ethernet port, your only option is to get a remote. Most universal remotes support Roku TVs or you can get the Roku simple TV remote for 10 bucks. The Roku voice remotes will also work, but they're more expensive.
Roku TV Remote | Replacement Remote For Roku TV | Roku
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