Manual should have this information very clear. No?
Anyway, Gear oils come in the packing of 1 liter mostly.
If I can suppose myself in your shoes, then I'll rather go to the workshop and will ask him to bring 3 bottles of MTF.
Firstly, pour 1st bottle and check the gauge (dip stick).
Then, pour 2nd bottle and check the gauge.
Then, pour half 3rd bottle and check the gauge.
And so on.... till the gauge shows full.
Its simple to measure as far as its matter of oil quantity only.
A word of wise, never buy MTF from Honda. Firstly find out from the manual that what viscosity of gear oil is required for your car & quantity. And try to find the same oil from outside market (from good oil shops) but for imported companies like Liqui Moly, PTT Performa, or Kixx's gear oils are also OK. Its time to change our habits for buying oils from local companies like Caltex, Shell, Honda, Toyota, Suzuki, total, PSO, etc. Imported oils are far better w.r.t quality endurance and strong determination.