Werewolf,
It's true, they could carry two bombs in that weight range, like 100kg, or four 50kg bombs, perhaps. However, La-5FN's, and the La-7 of 1944 were generally not used in a ground support capacity, because the oil cooler was below the nose, and tended to get hit a lot from groundfire. The only fighters(this includes lend lease too) that did ground support to any great degree were the I-153, I-16, Yak-1, Yak-7, and LaGG-3. Most other fighters tended to do ground support at times, but very infrequently. Also, I suspect that the La-5FN's limited range, even by Soviet standards, detracted from its use in that capacity.
If I'm going to do ground support give me a Il-2, Pe-2, Tu-2 or even a Yak-7 or I-16.
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129 IAP VVS RKKA