The phrase "ability to grind" is correct and usable in written English.
It can be used to describe someone's capacity or skill to persistently work hard or endure challenges, often in a competitive context.
Example: "His ability to grind through long hours of practice is what sets him apart from his peers."
Alternatives: "capacity to persevere" or "skill in enduring".
I have a large ability to grind.
In the A.L.C.S., Moreland frustrated Yankees pitchers with his ability to grind out long at-bats.
He has a cheerful, even temperament and also a small man's patience and ability to grind.
Theo Walcott believes Arsenal's ability to grind out a victory over Newcastle on Saturday proves they have title-winning credentials.
The ability to grind hardened materials without the previously necessary prehardening machining saves intermediate part-handling operations.
Among his peers, his talent and shotmaking ability were legendary, but his ability to grind out a tough match was sometimes questioned.
The ability to "ground truth" results with conventional measurements is also necessary.
Many critics point to the sociological aspects of her writing, but it's Kramer's ability to ground these aspects in individual narratives which distinguishes her reporting.
Mr. Lewis's gift is to turn highly complex phenomena into engaging stories, while Mr. Sorkin possesses the complementary ability to ground lofty abstractions in recognizable human motives and aspirations.
In effect, Machine Learning based approaches to provide robots with an ability to ground symbols heavily rely on ad hoc perceptual representation provided by AI designers.
Thrall's conclusion should be taken to heart: "In a Trump-dominated news environment the world loses its complexity and we lose the ability to ground foreign policy in a realistic and sophisticated debate about how to meet the challenges we face.
