add $$ around a line

[rputikar]

Hi, I would like to add $$ around a line

e.g.

T = T_0

to
$$
T = T_0
$$

I tried to do Vsa but it allows me to only add a single $ sign.

Also what is the easiest way of enabling all the shortcodes from tex.vim in quarto that does not involve changing filetype to tex. I am using nvim 0.9.5

Thanks, Ranjeet.