Assume I have 2 files in a folder

```
...
product: Nike New Awesome Running Shoe
price: 123
color: black
...

```

```
...
product: Nike New Awesome Salloon Soccer Shoe
price: 123
color: black
...

```

I need to accomplish bellow scenario **using single SED command**, in all files using \*.txt

I need to search in (product:) line if it contains the string Salloon Soccer (this is an example, it could be another terms/strings).

The search MUST apply ONLY IN THE product: LINE

And ONLY if contains that string, create a new line with (venue: indoor)
The other file that do not contain the "search term" keeps intact.
Look bellow the 2 files result:

```
...
product: Nike New Awesome Running Shoe
price: 123
color: black
...

```

```
...
product: Nike New Awesome Salloon Soccer Shoe
venue: indoor
price: 123
color: black
...

```