shell-script-to-add-new-line-to-existing-file

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I have a scenario where i need to insert a line in file using shell script

file content:

names = [
"victor-${env}/appname",
"steve-${env}/appname2",
"test-${env}/appname3"
]
there is a variable named 'appName' and value will be dynamic.

NOW, i will have to insert in >>> ( "test2-${env}/$appName", ) to file in any line between '[]'

Note: appName above is dynamic

I have tried sed command but its not picking up the dynamic value. sed -i '5i /$appName' file

expected file output:

names = [
"victor-${env}/appname",
"steve-${env}/appname2",
"test2-${env}/$appName",
"test-${env}/appname3"
]