I don’t think we have enough information to help based on this template alone. How is this.fieldValue defined?
If you enter user_field_5 in the site setting Public user custom fields… you should be able to access it from this plugin outlet
Either in your template like: {{@user.custom_fields.user_field_5}}
or in your JS as: this.args.user?.custom_fields?.user_field_5
Alternatively, if you don’t want the field to be public you can skip the site setting change and use this.args.user?.user_fields?.[5]