How to add/expose off-branded Google Home/Alexa Supported smart devices such as plugs and switches to Home Assistant

I have bought and Installed several non branded smart switches and plugs from amazon which supports Google Home/Alexa and I am unable to add them into my Home Assistant Installed on my Raspberry Pi. Other Devices work perfectly fine such as WLED or WebOS TV.

Please help
I am attaching the screenshots of these brands and their apps.