It is very easy to make a Brotli file that would give the entire Brotli built-in dictionary when extracted, just call this JS function to get the base64-encoded file:
function makeBrotliPreset_COMPACT() {
let r=0,b=0,n=0,z=0,w,d,e,f=i=>{for(n+=i;n>7;n-=8)r.push(b&255),b>>=8};
[40,152,97,209,26,138,12,124,68,179,18,73,128,184,45,100,156,211,1,28,56].map((v,i)=>{
for(w=0;w<(32<<v%7);z+=4+i) {
d=z+w++;
for(e=0;d>>e+2;d-=2<<++e);
b|=(e*8738&4740)%63*32+v/7<<n;f(9);
b|=d%(2<<e)*2+(d>>e+1)<<n;f(e+2);
}
});
return'U5/fAQA4OCClQ2D/NdDb5IaNGzcQ'+btoa(String.fromCharCode(...r,b));
}