For SEAD/DEAD based Operations, you typically need a very powerful EW platform to help jam & burn through enemy air defence Radars. Keep in mind that there are various methods of jamming used in modern warfare. Look at the Boeing EA-18G Growler as an example. It being larger than the LCA, more than twice as heavy and has two F414-GE-400 engines instead of just one GE F404 engine on the Tejas. Having two engines is a plus point as along with producing more thrust, it also generates far more electrical power which is necessary for the jammer to run on. Simply put: More power => More jamming.
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China has designed and built its own EW platform on the basis of the J-16 which it calls as J-16D. If we want something on the likes of the J-16D or EA-18G, then ideally we should convert a limited number of SU-30MKI to Growler configuration to perform SEAD & DEAD missions. For this, we need to equip our Flankers with a robust EW warfare suite which is already in the works as you can see in this slide.
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But does that mean that the Tejas or its subsequent versions like the Mk-2 doesn't have any potential or room for growth to stand out as a powerful Electronic Warfare platform? Not really because compared to aircraft like the EA-18G, J-16D, the LCA has an advantage of boasting a smaller RCS owning to several RCS reduction features like the extensive usage of composites, small size, S-duct intakes. Yes the EA-18G also has S-duct intakes but as a whole, the RCS of LCA is magnitudes times less than that of either EA-18G or J-16D. From what I have read, the MWF will reportedly sport an RCS that is less than 1/4th of that of the current Mk-1 in service with the Indian Airforce.
So why all the talk about Jamming & RCS reduction? You see,
both Jamming & RCS have a synergy relationship. Read about "Radar burn-Through".
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Incase you didn't understand the above diagram, I will explain it in a more simplified manner, basically the further away you are from your target, the more jamming power you will need to compensate for the distance. Jamming signals degrade & lose their strength with distance so ideally you need to be as close to your target as possible to maximize your jammer's strength. That is why if have a lower RCS, you can get closer to your target and as a result your jammer will be more effective as there is less distance between you and your target. Ideally speaking for future SEAD operations, instead of Tejas Mk-1 or Mk-2, the AMCA will probably prove to be the best because of its VLO aka stealth capabilities. The F-35 is supposed to be very effective in these kind of missions involving SEAD & DEAD, so if the F-35 is capable of it, so will be the AMCA when it arrives.