How do I get a keyword search volume for the Play Store?

It is easier to search the keywords for an app store. Tools are available in the market as follows:

Step 1 - Click on the below link

App Store Optimization Tool #1 FREE For Keyword Research ASO & SEO

Step 2 - Select App Store from the below tabs

Step 3 - Select the target country where you would like to search.

put your relevant keywords & get the results.

you can also filter the keywords from the left side as shown in below figure & copy the keywords by checking the box.