Hi,
Yes you can.
You will need SMD (surface mount device) soldering skills and tools to do the repair.
Here’s a link to the ifixit [[Topic:Asus Chromebook C300MA DB01 Repair]] guides which may be of some help in gaining access to the DC power port.
Here’s a link to just one [https://www.ebay.com.sg/itm/Asus-Chromebook-C300MA-DB01-DC-Jack-Power-Socket-Port-Connector/282921754335?hash=item41df735edf:g:JxwAAOSwj2dXkSal:rk:1:pf:0|supplier] of the part.
It is shown only to give you an idea of the cost of the part and what it looks like.
There are other suppliers online that may suit you better. Just search for ''Asus Chromebook C300MA DB01 DC jack part'' to get results.
If doing the repair seems too daunting a task, contact a reputable, professional laptop repair service and ask for a quote to replace the socket.