Hi, @D7ve,
Thank you for reaching out to the community. I am pleased to help you with your concerns.
Regarding your question about how to add the EvoLux smart bulbs, you can refer to this article for instructions: Works with the Google Assistant light bulbs. There, you will find a list of Google-compatible devices from which you can select your brand device.
If your brand device is not listed, we'd appreciate it if you could take the time to share your feedback. Your opinion is valuable to us as we strive to enhance Google Home app features.
Related to your question about Alexa, you can add it to the Google Home and control some Google Nest devices. You can refer to this article for further information: Control Google Nest products with Amazon Alexa.
Feel free to reply if you have any questions.
Best regards,
Ana
