Sed insert text at line using variables

I have file with

File

foo
bar

I want to insert a line with text like this

text="some long text $100"
position="2"

I want to run

sed "$position a $text"

the result should be

foo
bar
some long text $100

The File isn’t 3 lines long this is just shortcode. Other tools can be used like awk

>Solution :

text='some long text $100'
position=2

sed "$position"'a\
'"$text
" file