There is no standard way to write Tamil in Google. However, there are a few methods that you can use to type Tamil in Google.
One method is to use a tamil input method editor (IME). This will allow you to type in Tamil using a standard keyboard. You can then copy and paste the text into Google.
Another method is to use a Tamil unicode font. You can download a Tamil unicode font and then type Tamil directly into Google.
If you want to type Tamil in Google Docs, you can enable the Tamil font in Google Docs. Go to the "Settings" menu and click on "Docs settings". Under the "General" tab, scroll down to the "Language" section and select "Tamil" from the drop-down menu.