How to create custom fields on tasklist that can be assigned via modeler

I want to create a custom field for tasklist that could be reusable and assigned to the form via Camunda Modeler. I read some ideas on this forum, but no one, even the docs, were clear about that.

In Modeler there is custom type, that indicates the java implementation of a componente, but that is similar to my idea.

An objective case that i am working is to manage a list of user objects, and i want to add or delete with the context of a task in mind, for example, the invitation for a meeting.

I would be glad if someone has an idea and could provide the steps to solve this.