want to write better raku

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Contents of data.txt provides a sample line from a syslog file
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[May  4 11:48:37] SECURITY[31715] res_security_log.c: SecurityEvent="ChallengeSent",EventTV="2020-05-04T11:48:37.805-0400",Severity="Informational",Service="SIP",EventVersion="1",AccountID="sip:8103@my.ipv4.addr.here",SessionID="0x7fbf5c0070d8",LocalAddress="IPV4/UDP/my.ipv4.addr.here/5060",RemoteAddress="IPV4/UDP/198.46.135.250/63113",Challenge="558e30b4"

Raku script to get the line
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use v6;
my $line = slurp "data.txt" ;
my $line1 = $line.split(".c:") ;
my $logprefix = $line1[0]~".c" ;
my $line4hash = $line1[1].subst("\"", "", :global) ;
my %linehash = LogPrefix => "$logprefix" ;
my $lineseq = $line4hash.split(",") ;
loop (my $i = 0; $i < 10; $i++) {
	say $lineseq[$i] ;
	my $mykv = $lineseq[$i].subst(" ", "", :g).split("=") ;
	%linehash.push: ($mykv[0] => "$mykv[1]") ;
  }
say %linehash.keys ;
say %linehash.values ;

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Output
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 SecurityEvent=ChallengeSent
EventTV=2020-05-04T11:48:37.805-0400
Severity=Informational
Service=SIP
EventVersion=1
AccountID=sip:8103@my.ipv4.addr.here
SessionID=0x7fbf5c0070d8
LocalAddress=IPV4/UDP/my.ipv4.addr.here/5060
RemoteAddress=IPV4/UDP/198.46.135.250/63113
Challenge=558e30b4

(EventVersion LocalAddress SessionID Severity Challenge LogPrefix RemoteAddress SecurityEvent AccountID EventTV Service)
(1 IPV4/UDP/my.ipv4.addr.here/5060 0x7fbf5c0070d8 Informational 558e30b4
 [May  4 11:48:37] SECURITY[31715] res_security_log.c IPV4/UDP/198.46.135.250/63113 ChallengeSent sip:8103@my.ipv4.addr.here 2020-05-04T11:48:37.805-0400 SIP)