Yes! You accomplish this by using a creative template in GAM. Directions below:
Delivery
> Creatives
> Creative Templates
> Select: 
> Label it: “Jeeng 3rd party impression tracker”
> Uncheck “Serve into a SafeFrame”
> Add the following variables:
Type > File
- Label: Image
Type > URL
- Label: Click
Type > URL
- Label: TPIU
Then, insert this SNIPPET:
<a href="%%CLICK_URL_UNESC%%[%Click%]" target="_new"><img src="[%Image%]"></a>
<meta name="impression_tracker" content="[%TPIU%]">
> Select “Save”
New Line Items:
Create a standard Line Item
Add Creatives
>User-defined template
> Select “Jeeng 3rd party impression tracker”
Notes: We support DFA, and need to check other sources
Verifying impression tracking
If this is the first time you are setting up a campaign with impression tracking, let your account manager know so they can check the creative urls.
Note that the impression data may take a while to appear in your third-party tracker.
FAQ
Q: For the 3rd party impression URLs, does %%CACHEBUSTER%% need to be changed to [CACHEBUSTER]?
A: No, %%CACHEBUSTER%% is the GAM macro so it will get replaced by GAM before we get the url.
Q: Can you use multiple impression trackers?
A: Yes. As long as there is a separate meta tag in the html snippet for each impression tracker.
Duplicate the following line and add a “1”, then “2”, etc as needed directly behind “TPIU” like so: “TPIU1”, “TPIU2”.
Example:
<a href="%%CLICK_URL_UNESC%%[%Click%]" target="_new"><img src="[%Image%]"></a>
<meta name="impression_tracker" content="[%TPIU1%]">
<meta name="impression_tracker" content="[%TPIU2%]">