Hello,
The following option will be included in the next release of phpdocx for createListStyle method:
'suff' (string) level suffix: tab, space or nothing
It's already available in the current testing branch but it's only available for users with an active LUS. We recommend you to purchase LUS to your license (https://www.phpdocx.com/updates) so you can download new features not available in the current stable branch. If you purchase the LUS please send an email to contact[at]phpdocx.com and we'll send you the updated class.
Regards.