Make sure to check this article to learn how Pipedrive integrations are set up and mapped to your custom fields.
If you want to create a new deal for submissions from involve.me, you can do so using Pipedrive automations. You can restrict this automation to only trigger for a specific project (condition "involveme_project is project_title") or for all involve.me projects (condition "involveme_project is not empty"). Make sure to create the custom field "involveme_project" first.
Check this example to lean how you could set it up:
You might also need to create a similar automation for trigger "Person updated" if you want to also have deals created for users that you already have on Pipedrive and are updated through the involve.me integration.