The indicator you are looking for should be social workers by industry, which is the biggest indicator of employment statistics.
However, at present, the national statistical system only requires the statistics of employees in urban units by industry, so it is still difficult to count social employees by industry.
Suggestion 1: Use the employment data of urban units instead, and focus the research scope on cities and towns.
Recommendation 2: Check the local yearbook, and some areas may provide data on social workers by industry.
Recommendation 3: For purely academic research, we can consider using the employment data of rural households in the yearbook for calculation, but the accuracy of the data is hard to say.