How to ignore unnecessary attributes in my response.xpath?

Question

I am trying to scrape some data with scrapy using xpath selectors and i would like to get rid of the unnecessary data, the xpath selector is the following:

values = response.xpath ('//table[@class="pd-table"]//tbody//tr//td/text()').getall()

I know with .getall I can extract all data from the selector, which gives me the list below (I have added line breaks to make the list more readable - there are no line breaks in the actual output):

['Electrical design', 'PNP', 'Output function', 'normally open', 
 'Sensing range [mm]', '4', 'Housing', 'threaded type', 
 'Dimensions [mm]', 'M12 x 1 / L = 60', 
 'Special feature', 'Gold-plated contacts; Increased sensing range',  
 'Application', 'Industrial applications / factory automation', 
 'Operating voltage [V]', '10...30 DC', 'Current consumption [mA]', '< 10', 
 'Protection class', 'III', 'Reverse polarity protection', 'yes', 
'Electrical design', 'PNP', 'Output function', 'normally open', 
 'Max. voltage drop switching output DC [V]', '2.5', 
 'Permanent current rating of switching output DC [mA]', '100', 
 'Switching frequency DC [Hz]', '700', 'Short-circuit protection', 'yes', 
 'Overload protection', 'yes', 'Sensing range [mm]', '4', 
 'Real sensing range Sr [mm]', '4 ± 10 %', 'Operating distance [mm]', '0...3.24', 
 'Increased sensing range', 'yes', 
 'Correction factor', 'steel: 1 / stainless steel: 0.7 / brass: 0.5 / aluminium: 0.4 / copper: 0.3', 'Hysteresis [% of Sr]', '3...15', 
 'Switch point drift [% of Sr]', '-10...10', 
 'Ambient temperature [°C]', '-40...85', 
 'Protection', 'IP 65; IP 66; IP 67; IP 68; IP 69K', 
 'EMC', '\n                        \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n', 
 'EN 61000-4-2 ESD', '4 kV CD / 8 kV AD', 'EN 61000-4-3 HF radiated', '10 V/m', 
 'EN 61000-4-4 Burst', '2 kV', 'EN 61000-4-6 HF conducted', '10 V', 'EN 55011', 'class B', 
 '\n', 'Vibration resistance', '\n                        \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n', 
 'EN 60068-2-6 Fc', '20 g (10...3000 Hz) / 50 sweep cycles, 1 octave per minute, in 3 axes', 
 '\n', 'Shock resistance', '\n                        \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n', 
 'EN 60068-2-27 Ea', '100 g 11 ms half-sine; 3 shocks each in every direction of the 3 coordinate axes', 
 '\n', 'Continuous shock resistance', '\n                        \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n', 
 'EN 60068-2-27', '40 g 6 ms; 4000 shocks each in every direction of the 3 coordinate axes', 
 '\n', 'Fast temperature change', '\n                        \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n', 
 'EN 60068-2-14 Na', 'TA = -40 °C; TB = 85 °C; t1 = 30 min; t2 = < 10 s; 50 cycles', 
 '\n', 'Salt spray test', '\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n', 
 'EN 60068-2-52 Kb', 'severity level 5 (4 test cycles)', '\n', 
 'MTTF [years]', '1642', 'UL approval', '\n                        \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n', 
 'UL Approval no.', 'A001 ', '\n', 'Weight [g]', '27.7', 
 'Housing', 'threaded type', 'Mounting', 'flush mountable', 
 'Dimensions [mm]', 'M12 x 1 / L = 60', 
 'Thread designation', 'M12 x 1', 
 'Materials', 'brass white bronze coated; sensing face: PBT orange; LED window: PEI; lock nuts: brass white bronze coated', 
 'Display', '\n      
                  \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n', 
 'switching status', '4 x LED, yellow', '\n', 
 'Items supplied', '\n     
                   \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n', 
 'lock nuts: 2', '\n', 'Pack quantity', '1 pcs.', 
 'Connection', 'Connector: 1 x M12; Contacts: gold-plated']

Within the list, each pair of data is equivalent to 1 Element which I want to format similarly to the sample below:

['Electrical design' : 'PNP', 
'Output function' : 'normally open
....
'EMC' : 'EN 61000-4-2 ESD' : '4 kV CD / 8 kV AD' , 'EN 61000-4-3 HF radiated' : '10 V/m', 
...
'Connector: 1 x M12 : Contacts: gold-plated']

I hope I was able to explain myself clearly. I need help to transform the raw data to a formatted list.