I have created a table in Google Visualization which uses the following code:
I'm also new with Google Charts, but have explored so many of the options that I have a pretty good understanding to how to stylize your table.
See this link for proper Google example: https://developers.google.com/chart/interactive/docs/examples?hl=fr
Ultimately, what you do is assign a class name to the table row. After you can assign any CSS code you want. There is the alternative where you can use inline CSS, but I do not recommend it.
Inline style is as follows
[{v: 'cell string', p: {'style': 'font-weight: bold;'}}],
You can also add your formatting, or anything else.
If you need further clarification, do not hesitate to reply to my thread.