Although not entirely obvious it is possible to export and import text substitutions, just drag this file into System Preferences > Keyboard > Text.

text-subsitutions.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
	<dict>
		<key>phrase</key>
		<string>↑</string>
		<key>shortcut</key>
		<string>,,^</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>←</string>
		<key>shortcut</key>
		<string>,,&lt;</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>→</string>
		<key>shortcut</key>
		<string>,,&gt;</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>☞</string>
		<key>shortcut</key>
		<string>,,&gt;f</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>☆☆☆☆☆</string>
		<key>shortcut</key>
		<string>,,0stars</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>★☆☆☆☆</string>
		<key>shortcut</key>
		<string>,,1star</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>★★☆☆☆</string>
		<key>shortcut</key>
		<string>,,2stars</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>★★★☆☆</string>
		<key>shortcut</key>
		<string>,,3stars</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>★★★★☆</string>
		<key>shortcut</key>
		<string>,,4stars</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>★★★★★</string>
		<key>shortcut</key>
		<string>,,5stars</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string></string>
		<key>shortcut</key>
		<string>,,aapl</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>⌥</string>
		<key>shortcut</key>
		<string>,,alt</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string></string>
		<key>shortcut</key>
		<string>,,apple</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>My battery is low and it is getting dark.</string>
		<key>shortcut</key>
		<string>,,battery</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>Dear diary, </string>
		<key>shortcut</key>
		<string>,,bob</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>BE 0692 553 868</string>
		<key>shortcut</key>
		<string>,,btw</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>✓</string>
		<key>shortcut</key>
		<string>,,check</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>●</string>
		<key>shortcut</key>
		<string>,,circle</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>⌘</string>
		<key>shortcut</key>
		<string>,,cmd</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>⌘</string>
		<key>shortcut</key>
		<string>,,command</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>^</string>
		<key>shortcut</key>
		<string>,,control</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>✄</string>
		<key>shortcut</key>
		<string>,,cut</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>Duts Toch™</string>
		<key>shortcut</key>
		<string>,,dt</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>⏏︎</string>
		<key>shortcut</key>
		<string>,,eject</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>☆</string>
		<key>shortcut</key>
		<string>,,estar</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>It is I, le Franz, I am disguised as </string>
		<key>shortcut</key>
		<string>,,franz</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>½</string>
		<key>shortcut</key>
		<string>,,half</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>It depends …</string>
		<key>shortcut</key>
		<string>,,id</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>JA {{NAME}} JA</string>
		<key>shortcut</key>
		<string>,,janame</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>{code:ruby|borderStyle=solid|borderColor=aliceblue|borderWidth=2}
{code}</string>
		<key>shortcut</key>
		<string>,,jiracode</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>```</string>
		<key>shortcut</key>
		<string>,,kvothe</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>₁</string>
		<key>shortcut</key>
		<string>,,l1</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>₂</string>
		<key>shortcut</key>
		<string>,,l2</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>₃</string>
		<key>shortcut</key>
		<string>,,l3</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>(Sent with lasers)</string>
		<key>shortcut</key>
		<string>,,lasers</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>ಠ_ಠ</string>
		<key>shortcut</key>
		<string>,,lod</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>/me plays sexyback</string>
		<key>shortcut</key>
		<string>,,mepsb</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>№</string>
		<key>shortcut</key>
		<string>,,no</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>♪</string>
		<key>shortcut</key>
		<string>,,note</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>of wel of ni of wa</string>
		<key>shortcut</key>
		<string>,,ofni</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>⌥</string>
		<key>shortcut</key>
		<string>,,option</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>✚</string>
		<key>shortcut</key>
		<string>,,plus</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>pjaspers invitational extra trail™</string>
		<key>shortcut</key>
		<string>,,ptrail</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>♻︎</string>
		<key>shortcut</key>
		<string>,,recycle</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>²</string>
		<key>shortcut</key>
		<string>,,s2</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>³</string>
		<key>shortcut</key>
		<string>,,s3</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>•</string>
		<key>shortcut</key>
		<string>,,scircle</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>⇧</string>
		<key>shortcut</key>
		<string>,,shift</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>¯\_(ツ)_/¯</string>
		<key>shortcut</key>
		<string>,,shrug</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>◼︎</string>
		<key>shortcut</key>
		<string>,,square</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>To place on or as if on alternating sides of a center line; set in a zigzag row or rows</string>
		<key>shortcut</key>
		<string>,,staggered</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>★</string>
		<key>shortcut</key>
		<string>,,star</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>(╯°□°）╯︵ ┻━┻</string>
		<key>shortcut</key>
		<string>,,tableflip</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string> ┬──┬◡ﾉ(° -°ﾉ)</string>
		<key>shortcut</key>
		<string>,,tablerestore</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>™</string>
		<key>shortcut</key>
		<string>,,tm</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>:sparkles: :star: The More You Know :sparkles: :star:</string>
		<key>shortcut</key>
		<string>,,tmyk</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>↓</string>
		<key>shortcut</key>
		<string>,,v</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>(∩｀-´)⊃━☆ﾟ.*･｡ﾟ</string>
		<key>shortcut</key>
		<string>,,wizard</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>✖︎</string>
		<key>shortcut</key>
		<string>,,x</string>
	</dict>
	<dict>
		<key>phrase</key>
		<string>On my way!</string>
		<key>shortcut</key>
		<string>omw</string>
	</dict>
</array>
</plist>

Text substitutions: https://support.apple.com/kb/PH25699
Importing and exporting them: https://support.apple.com/en-us/HT204006