Set a transform function on fluent-json-schema

[bacloud22]

Hi
I saw there is the option to set transforms as an options like:

const fastify = require("fastify")({
  logger: true,
  ajv: {
    plugins: [[require("ajv-keywords"), "transform"]],
  },
});

So this works along with plain JSON schemas , For me I'm using "fluent-json-schema". Is there a way to add a transform function on fields ?

like:

export const userLoginSchema = S.object()
    .prop('firstName', S.string().minLength(2).maxLength(40)), // .transform() <-- trim and lowercase for example. or even add a custom transformer 
    .prop('username', S.string().format(S.FORMATS.EMAIL))
    .prop('password', S.string().minLength(8).maxLength(40))
    .required(['username', 'password'])

Thanks a lot for your help