rest api request including meta_query filter

I’m creating a web service using the WP REST API v.2.
Is it possible to include something like a meta_query filter when requesting a custom post type?

For example, if I was using WP_Query, I could do this:

$args = array(
    'post_type'         => 'proposal',
    'posts_per_page'    => -1,
    'meta_query'    => array(
        array(
            'key'       => 'deadline',
            'value'     => current_time( 'm/d/Y' ),
            'compare'   => '>=',
        )
    )
);

$proposals_query = new WP_Query( $args );

Is it possible to accomplish the same thing in a REST request?
The example goal would be to let the service know that the client wants a response that only includes posts that meet the meta_query conditions.
I guess I could send a variable in the request and use that to build a meta_query in a custom endpoint…? So I’m wondering if there is some recommended way to proceed.