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QgsJsonUtils class has exportAttributes method for getting attributes as dict.

Solution 1:

Making a dictionary including feature id as key, attributes map as value like:

{feature1.id: {attr1: value, attr2: value, ...},
 feature2.id: {attr1: value, attr2: value, ...},
 ...}

layer = QgsProject.instance().mapLayersByName('LAYER_NAME')[0]
features_dict = {f.id(): QgsJsonUtils.exportAttributes(f) for f in layer.getFeatures()}

Solution 2:

Making a list including attributes map (dict) of features without ids like:

[{attr1: value, attr2: value, ...}, # feature 1
 {attr1: value, attr2: value, ...}, # feature 2
 ...]

layer = QgsProject.instance().mapLayersByName('LAYER_NAME')[0]
features_list = [QgsJsonUtils.exportAttributes(f) for f in layer.getFeatures()]