how do you go though data frame values in chunks and combine them?

I have this data frame:

Metric  ProcId  TimeStamp               Value
CPU     proce_123   Mar-11-2022 11:00:00    1.4453125
CPU     proce_126   Mar-11-2022 11:00:00    0.058320373
CPU     proce_123   Mar-11-2022 11:00:00    0.095274389
CPU     proce_000   Mar-11-2022 11:00:00    0.019654088
CPU     proce_144   Mar-11-2022 11:00:00    0.019841269
CPU     proce_1     Mar-11-2022 11:00:00    0.234741792
CPU     proce_100   Mar-11-2022 11:00:00    5.32945776
CPU     proce_57777 Mar-11-2022 11:00:00    0.25390625
CPU     proce_0000  Mar-11-2022 11:00:00    0.019349845
CPU     proce_123   Mar-11-2022 11:00:00    0.019500781
CPU     proce_123   Mar-11-2022 11:00:00    2.32421875
CPU     proce_123   Mar-11-2022 11:00:00    68.3903656
CPU     proce_123   Mar-11-2022 11:00:00    0.057781201
CPU     proce_123   Mar-11-2022 11:00:00    0.416666627

this is just a sample data frame, the actual data frame is in thousands of rows. I need to go though this data frame in chunks the "ProdID" column and I need to create a string combining these ProdID in chunks for each iteration.

For example the string needs to be like this given the chunks size 3:

proce_000%22%2C%2proce_144%22%2C%2proce_1%22%29
proce_100%22%2C%2proce_57777%22%2C%2proce_0000%22%29
proce_123%22%2C%2proce_126%22%2C%2proce_111%22%29

Please note after the 3rd chunk, we need to add "%22%29". After the first ad second we need to add "%22%2C%2".

I can do something like this to print out the chunks:

n = 3 #size of chunks
chunks = [] #list of chunks

for i in range(0, len(id), n): 
    chunks.append(id[i:i + n])

I am not sure how would I combine these 3 items in one string and add the others strings at the end. Can anybody help here?

from how do you go though data frame values in chunks and combine them?