Hi there, @kokolay.
I've got insights to share regarding adding a free trial payroll subscription to your QuickBooks Online account.
At this time, payroll subscription isn't currently offered to the international version of QuickBooks. You can only add payroll to your account if you're using the UK, Canada, Australia, and the US versions.
However, the free trial version of payroll is available for the US. This is called a standalone payroll. Here's a link that provides complete details about this feature: QuickBooks Payroll Plan.
You may also follow the suggestion presented by Fiat Lux - ASIA, so you can have a payroll service.
Know that our developers are always finding and considering new features to be added in the system to make the program work the way your business needs.
I'd encourage you to visit our QuickBooks Online Blog site, to stay in the loop with our latest happenings and enhancements.
I'll be around to help if you have any other concerns. Just let me know by leaving a reply below. Have a good one!