If you don’t mind something simpler, you can put this in ~/.config/ctags/zig.ctags:
--langdef=zig
--map-zig=.zig
--kinddef-zig=f,function,functions
--kinddef-zig=m,method,methods
--kinddef-zig=t,type,types
--kinddef-zig=v,field,fields
--regex-zig=/^(export +)?(pub +)?(inline +)?fn +([a-zA-Z0-9_]+)/\4/f/{exclusive}
--regex-zig=/^(export +)?(pub +)?[\t ]*const +([a-zA-Z0-9_]+) = (struct|enum|union)/\3/t/{exclusive}{scope=push}
--regex-zig=/^}///{exclusive}{scope=pop}{placeholder}
--regex-zig=/^[\t ]+(pub +)?(inline +)?fn +([a-zA-Z0-9_]+)/\3/m/{exclusive}{scope=ref}
--regex-zig=/^(export +)?pub +const +([a-zA-Z0-9_]+)(:.*)? = .*/\2/v/{exclusive}