Welcome to the forums, Kate
In order to do this, you will need to apply some of the same types of edits to your RAW file that your in-camera processor performs to create a JPG.
For my Canon 5D, I take LR's standard processing and add a Sat of +12 and a Clarity of +15 on import. (I also add a camera profile that I created using the DNG Profile Editor but that is another story).
Once you have tweaked the settings so that your RAW file more closely mimics your JPG (Those settings are primarily to your taste and everyone does it a little differently) you have a couple of options:
1. You can save your settings as a Develop Preset and apply it on import.
2. You can set LR to apply default processing based upon camera serial number and use the new settings (if you only use one camera you can just convert the develop processing.
3. You can sync up the adjustments between photos (most labor intensive)
My recommendation to you would be to shoot a few RAW+JPG photos and compare them side-by-side. Adjust the RAW photos to taste and then decide whether a preset or a default is the way to go for you.
We can help you set it up-whatever you decide.