@jonvitale-16770 replace the parameter in the braces with a liquid filter variable " _filters[‘view_name.field_name’] " for the field you will be filtering in your dashboard, and that should do the trick. Adapting @clathrop 's example, it would look something like this:
dimension: button_243 {
type: string
sql: '' ;;
html:
<a href='https://crystalloids.eu.looker.com/looks/56?Orders={{_filters['Borders.shipping_address_country_code']}}'target="_blank">
<span style='border:1px solid rgb(128, 134, 139); border-radius: 5px; background: rgba(128, 134, 139); color: rgb(255,255,255); padding: 3px;'>Send selection</span></a> ;;