Indeed, there are 2 micro’s on the front side of the controller board. At least one (the left side one) is an FTDI FT230X serial port for console access. No joy there for the purpose you are proposing. (Lots of joy there for other purposes .)
I haven’t investigated what the other one is. If it is connected to the i.MX6 Solo’s EHCI, then I guess it would be feasible.