Want to make a Match 3 Game Similar to Tiny Jelly. No Idea How to Implement Line Connect Mechanic.

Hello,

I am a new developer and I am trying to create a Match-3 Minigame for my larger project. However, I am only interested in making one similar to the title "Tiny Jelly". I don't want to swap the placement of my tiles like in Candy Crush but instead, drag to connect a chain matching tiles which clear once at least 3 have been connected and the player stops clicking the mouse.

For those of you who are unfamiliar, a screenshot from the inspiration game looks like this:

Any help with how to even begin to implement this will be appreciated. Thanks in advance!