Revolutionary heroes ranging from John Brown to Kim Il-Sung are isekai'd to a fantasy world that parodies shows like 'the rising of the shield hero' to break the chains of slavery in all forms once more and liberate the fantasy workers and the peasants from the yoke of feudal oppression while hunting down so-called "heroes" summoned by the feudal lords who intend to use them as tools to preserve their power and the economic base of their feudalistic slave economy.
Show me Stalin riding a chocobo or some shit leading a calvary charge against slaver caravans!
Show me Marx, Engels, and Lenin working together in the cities inspiring the proto-proletariate to take up arms against the feudal robber-barons and their land-leechs that bleed them dry
Show me Mao, Tito, and bonus character Jan Žižka, on a rural bro-venture with the three in a competitive rivalry to see who can organize the greatest peasant rebellion between the three!
I think the best story that sounds like what you're describing is the historical fiction book "Mediterranean Hegemon of Ancient Greece" by Chen Rui. Take a Chinese Civil servant - who's probably a party cadre - who's an ancient history nerd and throw him in the body of a random Greek mercenary that died during the campaign of the ten thousand under Cyrus the Younger, and see what kind of hijinks he gets up to.
Real slow burn, the writer doesn't show too much Chinese chauvinism beyond asserting the Greek were too backwards to think of making sausages as a means of rational preservation. Beyond that the writer introduced minor technological or organizational improvements that wouldn't look too out of place from the time period instead of using his modern knowledge to drop things like gunpowder, steel, or the steam engine to try and rapidly modernize the environment he found himself in. The book primarily focuses on matters of war and governorship with minor focuses on diplomacy and religion and overall when I read it I was quite enthralled by it.
Mmm. Sounds really good.