how would you do it for routerOS 7

/routing filter
add action=accept chain=AS28146-IPv4-OUT bgp-communities=65001:666 prefix-length=32 set-bgp-communities=28146:666
add action=accept chain=AS28146-IPv4-OUT prefix=45.189.228.0/22 prefix-length=22-23
add action=discard chain=AS28146-IPv4-OUT

have you reviewed the readily availably docs? Route Filtering had a big logic change from v6 to v7.