How to trigger an Install Card in Google Meet Chat?

[SYChang]

I noticed that when I paste the Read.ai website URL (https://www.read.ai/) into the Google Meet in-call messages, it automatically shows an interactive card with an “Install” button for their Meet add-on.

For most add-ons, only the official Google Workspace Marketplace link triggers this kind of install card; custom website URLs don’t work.

Does anyone know how this partnership works? Is it limited to Google-selected partners, or is there a way for other developers to enable similar behavior for their own product websites?

Would appreciate any insights or official documentation on how this card trigger is managed!