One of the options is you include a specific configuration in your file settings.json. There are two ways you can do this.
Accessing the VS CODE "Preferences" screen
To access VS Code preferences, you must use the shortcut CTRL+, (in my OS is this shortcut, it may vary in others). You can also use the menu: File > Preferences > Settings.
When opening the configuration screen, you need to type "files.Associations" and add a value in "Item" and "Value". The values are respectively, *.tpl and html, as shown in the image:

Editing the settings.json directly
If you prefer to edit the file settings.json, you must click on the icon acíma, located on the right, called "Open Settings (json)".

Then add the line:
"files.associations": {
"*.tpl": "html"
},
Upshot
After doing so, by typing any code into a file .tpl, you will get an autocomplete as follows:

Related: https://answall.com/questions/456897/vs-code-n%C3%A3o-autocomplete-tags-html-ou-css-em-uma-Blade-Laravel
– Wallace Maxters
Related: https://answall.com/questions/287219/howto use shortcuts-do-bootstrap-no-vscode-em-arquivos-blade?rq=1
– Wallace Maxters