It could be a Cercospora leaf spot, a fungal disease caused by Cercospora beticola. How is the weather there? Normally the disease is favored by high temperatures, humidity and long leaf wetness periods at night.
The main symptoms are appearance of "numerous, initially small circular leaf spots . Spots have a pale brown to off-white center with a red margin. Lesions expand in size, coalesce, turn gray as the fungus sporulates, and can result in extensive loss of foliage. Leaves at the center of the plant are often less severely affected. The pathogen produces sclerotia or stromata which can be seen with a hand lens as small, black dots in the center of lesions. Lesions may also occur on petioles, flower bracts, seed pods, and seeds. Leaf symptoms are similar to those caused by Beet Phoma (Phoma betae), except that the phoma will have more obvious tiny fruiting bodies in the lesions and can also affect the roots."
https://ag.umass.edu/vegetable/fact-s...
Cercospora leaf spot of beet
Cercospora leaf spot of Swiss chard
Cercospora leaf spot of Swiss chard
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