Yes, it is possible, but you will need to use a computer - I don't think it would work on an app.
Go to the game that you want to continue and go to the position you want to start from. Click on the download button and copy the FEN that pops up.
Next, go to the analysis board https://www.chess.com/analysis and where it says Load FEN, click that and paste the FEN that you copied into the box that appears and push load.
You should see a button down the bottom that says vs computer (looks like a laptop with vs on the screen) Click that and it will open up a page where you will be playing against the computer from the FEN position. You can click on where it says "Level 3" - or whatever level it is to change the difficulty and which colour you're playing
Is it possible to do this?
I was having fun playing against a player and I want to continue the game from that position but against the computer considering the player left. Thanks.