To do this you will need to write JavaScript. You will need to attach an event to the first field that makes an AJAX request to the values for the second field and populate the values.
Alternately you can create a script that gets localized with all of the values.
Sorry, I do not have example code that I can supply for this.
Here is an example https://stackoverflow.com/questions/5861090/populating-one-select-box-based-on-the-selection-in-another-select-box-jquery
Info on AJAX in WP https://codex.wordpress.org/AJAX_in_Plugins
Info on localizing scripts: https://developer.wordpress.org/reference/functions/wp_localize_script/
