Custom query parameter on postgrest-js

As an advanced usage, Change to able the add custom query parameter.
Is that a good idea? that feature already exists?

For example, You have custom postgrest filter query builder in your project.
If you want to work that builder with postgrest-js. but the builder forces follow postgrest-js's interface. (NOT postgrest interface)

When postgrest added some new feature, postgrest-js users need to wait for postgrest-js update. It's inconvenient, I think.

For more convenience, users can modify a postgrest-js query parameter itself.
Like below.