Yes, all reports can be fetched in different formats such as JSON, XML, CSV, HTML and more, so you can integrate your measured form data anywhere. Read more about the Matomo (Piwik) HTTP Reporting API and view the Reporting API Reference.

Taking the following report as an example:

The request could be:

https://demo.matomo.cloud/index.php?module=API&format=XML&idSite=1&period=day&date=yesterday&method=CustomReports.getCustomReport&idCustomReport=5&reportUniqueId=CustomReports_getCustomReport_idCustomReport--5&expanded=1&token_auth=anonymous&force_api_session=1&filter_limit=10

This data is from our demo, click here to see the result of this request

Previous FAQ: Will the Custom Reports reports be shown in the Matomo Mobile app for Android and iOS?