Is there any option assign resources on project plan with no effort/duration/allocation control?

Summary:

Option to avoid allocation/effort/duration constraint

Content (required):

The customer would like to assign labor effort for a specific resource on project plan tasks without having a constraint fixed duration or a fixed effort calculation, without a constraint between allocation/duration/effort

Version (include the version you are using, if applicable):

23B

Code Snippet (add any code snippets that support your topic, if applicable):