Title IV-A of ESEA names this work directly. The statute authorizes college and career guidance and counseling programs, postsecondary education and career awareness and exploration, training counselors on postsecondary planning, and federal financial aid awareness activities, and it separately authorizes running those programs in partnership with an outside provider. Where a school operates a schoolwide Title I program, Title I-A lists preparation for and awareness of postsecondary opportunities among its allowable schoolwide strategies, and that is usually the larger allocation of the two.
Two honest notes. A single-site charter’s Title IV-A allocation often sits near the statutory minimum, so it may cover the training rather than the whole engagement. And the curriculum has to be supplemental to what the school already funds, which is one more reason this is built to sit alongside your counseling office instead of in place of it.
I will write the scope to match whichever stream you are using. I am not your federal programs officer, and allowability is a question for whoever is.