You are able to access your form submission schema from the Forms menu. This is commonly used when creating integrations through Power Automate (Microsoft Flow) and when using the Parse JSON Connector to pull specific information out of the form submission.
As a developer, you may also wish to use this to validate submissions in your integration code.
Instructions
Navigate to Forms
Click the three-dot action menu next to the desired form
Select View Schema
The Form Submission JSON Schema will open, click Copy to Clipboard to copy the schema
If you are accessing the schema for the purpose of a Power Automate integration, then the schema can be pasted directly into the Parse JSON connector in Power Automate