Broker fixed risk offer

Hi to every1

Just one question. I have been searching for the broker who offers the option of fixed amount of money risked per trade. So to put it this way instead of converting lots and adjusting lots to amount of dollars, isn’t there a broker which offers an exact amount of dollars invested you want to specify every time you want to open a position?

I could not find it on google, whatever i typed some random search results I get.
All best