May I offer a suggestion: one way to make setting up a new project easier in terms of adding project members:
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We can create teams of users in our organization settings, for e.g. development team, marketing team, etc. For reference, see View and create teams support article.
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Then when creating a new project, we can invite the team into the project. This saves time from adding members individually. For reference, see Utilising team function in Backlog.
Sorry, I know this doesn’t answer your question completely, but I hope it eases the process of setting up a new project.