How to compute random bfloat number in Maxima CAS

Maxima Cas random function takes as an input floating point number and gives floating point number as an output.

I need floating point number with more digits, so I use bfloat with increased precision.

I have tried :

random(1.0b0)
bfloat(random(1.0));

The best result was :

(%i11)  :bfloat(%pi)/6.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000b0
(%o11) 5.235987755982988730771072305465838140328615665625176368291574320513027343810348331046724708903528447b-1

but it is not random.