It's not in any form, but as I mentioned previously, I personally learned several ways to get up from my Sifu, all of which he learned from the other Martial Arts he knows. Wing Chun itself doesn't provide any method of standing up. In Shaolin I can think of 10+ ways of standing up.I agree with KPM that Ip Man 'Classical Wing Chun' is unprepared for modern MMA or many realistic street encounters.
The WC guy in the Xu Xiaodong fight above is making the 'classical' mistake of keeping his lead leg extended - presenting a near target - a side-body neutral stance is more traditional.
When I trained with the EWTO they did include Anti-grappling / groundwork as part of the curriculum but their footwork / facing strategy was sorely lacking.
One of Ip Chun's top students came off worst vs an MMA guy years ago:
At least some lineages are now including methods to deal with varied attacks, but yes, WC is in a delusional state.
Criticize Sifu Benny Meng all you want but he was ahead of the curve in this aspect.
Why is there not even a method to get up from the ground in any of the WC forms? I was told it is at the end of the Bil Jee form but if you try to use it, it hardly works! (There is a good method in Monkey Kung FU for getting up which I am adding to my personal curriculum).