After fleeing Portugal, the Portuguese King himself imported Chinese labour from Macau to one of his personal properties to introduce tea cultivation in Brazil. For some reason, it didn't work out.
At the beginning of the ninetieth century, by initiative of D. João VI, a group of chinese immigrants were brought tho Brazil to plant tea.
The idea was for the tea to be produced in the "Ilha do Governador" and in the "Jardim Botânico", in Rio.
There were about 200-500 india and chinese workers, all of them with little to no qualification.
The crown wanted to start cultivating tea in Brazil to increase crown's income, however, the climate and the soil were inappropriate, and there were no specialized workers, so the whole plan fell apart.
Maybe if the plan worked, we'd see a larger amount of people from Macau being brought, and that may translate into a larger contingent of chinese immigrants once things start going badly in china?
Another problem is that as soon as abolitionism becomes stronger we'll see the same thing that happened OTL start again, the economical elite will start to look for two different things:
1)The "whitening" of the brazillian population, which will see the encouragement of European immigration.
2)They will start to look for cheap sources of labour to substitute slavery, which might discourage the chinese from coming to Brazil, as it did to the europeans OTL.