How to add Project Plan Type to Projects in bulk?

Summary:

How to add Project Plan Type to Projects in bulk?

Content (please ensure you mask any confidential information):

Hi Team. We created a Project Template and did not add a project plan type to it. This template was later used to create Projects. However, now, when we are trying to add tasks to these projects, it is giving an error message that we need to add the Project Plan Type first. We are able to add the Project Plan Types manually to the projects, but the count is huge. Can you please tell us if there is a way (maybe using REST API) to add the project plan type to multiple projects at once?