There are a few ways you can target specific apps with Google Ads:

1. Use app install campaigns: If you want to promote your app and encourage installations, you can use one of the ad campaign types I mentioned earlier, such as search ads, display ads, or universal app campaigns. These campaigns are specifically designed to promote app installations and allow you to target users who are likely to be interested in your app.
2. Use in-app advertising: If you have an existing app and want to target users within that app, you can use in-app advertising. This allows you to show ads to users who are already using your app, or to users of other apps that are similar to yours.
3. Target specific app categories: When you create an ad campaign, you can select specific categories or genres of apps to target. For example, if your app is a game, you can choose to target users who have downloaded and played other games.
4. Target specific devices: You can also target specific devices, such as smartphones or tablets, when creating an ad campaign. This can be useful if your app is only available on certain devices or if you want to reach users who are more likely to have certain devices.

Keep in mind that targeting specific apps or app categories will likely result in a smaller, more targeted audience, which can be beneficial if you’re trying to reach specific users. However, it can also limit the reach of your ads, so you’ll want to consider your overall goals and budget when deciding on your targeting strategy.