Another option is import all the users in a Dataverse Table or Can you use existing users table from Dataverse? Once the users are in Dataverse you could use liquid to retrieve the users in a Combobox.
Another workaround is create another entity (Dataverse) and create a lookup relationship to user custom users table or existing users table. Add the lookup in your form. This way you can expose the users info as lookup.
The above options are depends on your requirement.
Thanks
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