One way to "back up" :)

#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11130900
use warnings;

local $_ = <<END;
ok: [cgva1lbpmor001m] => {
   "result.stdout_lines": [
      "SOURCE                      FSTYPE   SIZE   USED  AVAIL USE% TA
+RGET",
      "kmhpemcfspa21:/oracle_depot nfs    130.1G  77.2G  52.9G  59% /e
+xport/oracle",
      "kmhpemcfspa21:/oracle_dump  nfs     11.5T   1.8T   9.7T  16% /e
+xport/oracle_dump"
    ]
}
ok: [otherhost] => {
   "result.stdout_lines": [
      "SOURCE                      FSTYPE   SIZE   USED  AVAIL USE% TA
+RGET",
      "kmhpemcfspa21:/oracle_dump  nfs     11.5T   1.8T   9.7T  16% /e
+xport/oracle_dump"
    ]
}
ok: [thirdhost] => {
   "result.stdout_lines": [
      "SOURCE                      FSTYPE   SIZE   USED  AVAIL USE% TA
+RGET",
      "kmhpemcfspa21:/oracle_other nfs     11.5T   1.8T   9.7T  16% /e
+xport/oracle_dump"
      "kmhpemcfspa21:/oracle_depot nfs    130.1G  77.2G  52.9G  59% /e
+xport/oracle",
    ]
}
END

my %hostspershare;

while( /"(\S+)\s+nfs\s/g )
  {
  my $share = $1;
  $` =~ /.*ok: \[(\S+?)\]/s and push @{ $hostspershare{$share} }, $1;
  }

use Data::Dump 'dd'; dd \%hostspershare;
[download]

Outputs:

{
  "kmhpemcfspa21:/oracle_depot" => ["cgva1lbpmor001m", "thirdhost"],
  "kmhpemcfspa21:/oracle_dump"  => ["cgva1lbpmor001m", "otherhost"],
  "kmhpemcfspa21:/oracle_other" => ["thirdhost"],
}
[download]