I suggest you to write a code in order to get the number of results.
You didn’t write but I assume you want to filter results by the current item of the dynamic page.
You can use wix-dataset api in order to get the current item you want to filter by. (wix-dataset - Velo API Reference - Wix.com)
Afterwards, use wix-data to write the filter query (https://www.wix.com/code/reference/wix-data.WixDataFilter.html#contains) and the results of the length you can set to the text component you want