Bicycle child seat for kid > 22kg?

I'd like to buy an electric assisted bike and carry my kid around. I've just noticed that most seats are for < 22kg. Anyone knows the right term to search for seats adapted to > 22kg?

Any recommendation?

Bike wise I'm looking at the TB1e ブリヂストン(BRIDGESTONE) due to "normal" size wheels and my abnormal weight for this country.

by TokyoBaguette