Not hard at all. Go to pro-football-reference.com, put in the guy's name then click on splits.
For their careers:
Goff is 73TD to 28 INT in 36 games. 2.6 to ` 1
Mahomes is 57-20 in 32 games. 2.86 to 1
Prescott 49-22 in 29 games. 2.2 to 1
Stafford 80-35 in 56 games. 2.3 to 1
Rodgers 115-29 in 60 games. 3.9 to 1
Brady 155-61 in 90 games 2.5 to 1
P Manning 134-76 in 70 games. 1.8 to 1
Brees 150-60 in 78 games 2.5 to 1
Not sure what to make of it but those are the numbers for December. Some of them are slightly better if you include January and some are slightly worse. Of note Dak's 13-2 ratio in January is the best of this group. The next closest would be Rodgers 21 to 4.