I'm having a while loop and need to append the outcome of the loop to the list(like in python) in bash script. How to do that. I created an array but there are no commas in it. It has only space but I want commas so that I can use them in the .env file

```
arr=()
while [ ]
do 
  ........
  ........
  ........
  val='some value'
  arr+=$val
done

echo ${arr}

```

output:

```
('some value1' 'some value2' 'some value3')

```

Expected Outcome:

```
['some value1','some value2','some value3']

```