VyOS provides policies commands exclusively for BGP traffic filtering and manipulation: community-list is one of them.
set policy community-list <text>
Creat community-list policy identified by name <text>.
set policy community-list <text> description <text>
Set description for community-list policy.
set policy community-list <text> rule <1-65535> action <permit|deny>
Set action to take on entries matching this rule.
set policy community-list <text> rule <1-65535> description <text>
Set description for rule.
set policy community-list <text> rule <1-65535> regex <aa:nnno-advertiseinternet|additive>
Regular expression to match against a community-list.