Need to be able to apply a tax on another tax on Hostaway

1.) What is the idea/improvement you'd like to see implemented? I need the lodging tax (in Québec, Canada) to be able to be taxed by other taxes (GST-QST) on Hostaway. Currently, we can't apply a tax on another tax on Hostaway (we can only apply it to night fees, cleaning fee, etc). BUT in Quebec, the lodging taxe IS TAXED by GST-QST... so we need to have this option on our platform. 

2.) What problem would this solve for you? It would allow us to charge correctly our guests and not have to take that extra amount from the night price... And also, it would show correctly the tax amount on the guest invoice. 

3.) What are you currently doing to work around this issue? We don't charge the correct amount of lodging tax to the guests and have to take it from our night revenue to pay it to the government. We changed our financial formula to calculate the correct lodging tax amount (but it doesn't correct it on the invoice for the guest and doesn't correct it on the amount that is charged to the guests).