I'm glad you asked plenty of these circuits exist on Amazon and eBay as long as you know the right term for them. DC 6-24V 24V 12V to 5V 3A USB Buck Voltage Converter Regulator Power Supply Module USB Charging Step Down Voltage Module https://www.amazon.com/dp/B07121W7Q4/

two USB ports KNACRO DC-DC Buck Power Supply Module Dual USB Output (6V- 40V) https://www.amazon.com/dp/B075LZLFRP/ref=cm_sw_r_cp_apa_i_TkZWDb7AY3ZW8

Four USB ports ( out of stock but still exists ) KNACRO DC-DC USB (8-35v) https://www.amazon.com/dp/B06XBZHJ4C/ref=cm_sw_r_cp_apa_i_TlZWDb01Z9PCE