Burnside groups with GAP system

[ArthurBesse]

My question is related to Burnside groups B(n, 3) in the GAP system. I'm interested in ways to represent Burnside groups B(n, 3) in GAP. The obvious representation using relations (see example for B(3,3) below) is quite complex, because obtaining relations for large n is not an easy task.

f := FreeGroup(3);;
a := f.1;;
b := f.2;;
c := f.3;;
rels := [a^3, b^3, c^3, (a*b)^3, (a*c)^3, (b*c)^3, (a^2*b)^3, (a^2*c)^3, (b^2*c)^3, (a*b*c)^3, (a^2*b*c)^3, (a*b^2*c)^3, (b^2*a^2*c)^3];;
g := f / rels;;

1. Is there a convenient way in GAP (maybe using some external package) to represent relatively free groups, in particular Burnside groups, in particular B(n, 3)
   ?
2. Is there a convenient way in GAP (maybe using some external package) to represent verbal subgroups (this can be used to simplify the method with relations mentioned above)?

Thanks in advance.